Two Puffs Too Bad: Demystifying Marijuana Urine Testing

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MJ, a 40 years old female, presents to  your pain clinic for a  routine follow-up visit. You decide to run a random urine drug screen by immunoassay (IA) and she tests positive for cannabinoids.

When asked, MJ admits “I only smoked two puffs five days ago”.

Fact or Myth?

Mena Raouf, a star PharmD Candidate,  took a closer look at this.
Here’s what he had to say…


Marijuana Pharmacokinetics

Δ9-tetrahydrocannabinol (THC) is the major psychoactive metabolite of cannabinoids, which is highly lipophilic and distributes into adipose tissue, liver, lung, and spleen. [1,3] Following inhalation, THC can be detected in the bloodJeff chemistry bow tie within seconds; however, its bioavailability varies depending on the depth and duration of inhalation. It is estimated that the bioavailability of THC is approximately 10-14% in occasional users and 23-27% in chronic users. [1,2]

As seen in figure 1 below, the psychoactive component (THC) of marijuana, undergoes hepatic hydroxylation to generate the equipotent metabolite Δ9_tetra hydrocannabinol (11-OH-THC) catalyzed by CYP 2C19 and 8β-hydroxy-Δ9-tetrahydrocannabinol (8 β -OH-THC) catalyzed by CYP 3A4. [1,3]  11-OH-THC undergoes oxidation to generate the inactive carboxy-Δ9-tetrahydrocannbinol (THCCOOH). Carboxy-Δ9-tetrahydrocannbinol is conjugated with glucuronic acid and excreted in the urine. 8β-OH-THC undergoes dehydroxylation to generate 8β,11-di-OH-THC, which indicates recent cannabinoid use if present. [1,3,4,5]    However, carboxy-Δ9-tetrahydrocannbinol is the most abundant and prevalent metabolite and is ultimately the compound of interest for urine drug screening. [1,3,5]

Figure 1: Metabolism of THC Following Smoking
THH chemistry schematic_PP fig-1_BMP








Urine Detection

Figure 2 illustrates how THC and its metabolites are eliminated in the urine and feces as shown in a study by Manno et al. [8] where cannabinoids were measured in the urine in 8 subjects that smoked a marijuana cigarette containing 27mg of THC.  THC urine concentrations peaked at 21.5 ng/mL in 2 hours  and were undetectable (<1.5 ng/mL) in 5 out of 8 subjects after 6 hours. Urine concentrations of 11-OH-THC and THC-COOH peaked at 3 hours and 4 hours respectively.  THC-COOH, the compound of interest in urine drug screening, has a urinary half-life of 2-3 days. [5,6,8,10]

Figure 2: concentrations of THC metabolites in the urine following smoking [1,8]
THH chemistry schematic_PP fig-2_BMP

Following a single marijuana use, THC is unlikely to be detected in the urine beyond 3 days at the 50 ng/ml cut-off level and beyond 7 days for the 20 ng/mL cutoff level. [4] For a single use based on the 50ng/mL cutoff, carboxy-Δ9-tetrahydrocannbinol can be detected in the urine within 3 days. For moderate use (4 times/week), the detection winodw is  5-7 days. For daily use, the detection window is 10-15 days with up to 30 days for long-term chronic smokers. [9] Detection times are summarized below in table 1.

Table 1: Marijuana Urine Detection (IA) Time Based on Use [7]

Frequency of use Detection window (days)
Single use 3 days
Moderate use (4 times/week) 5-7 days
Daily use 10-15 days
Chronic heavy use >30 days

Now back to our patient MJ

If the patient truly smoked “2 puffs 5 days ago”, then she should have tested negative based on the 50 ng/mL laboratory cut-off by immunoassay. Her positive test at this cut-off translates to moderate use (4 times/week).

Marijuana is still the most commonly detected substance of abuse on urine drug screening by IA, but let’s not forget that false positives are common with cannabinoids as elucidated and identified in Dr. Fudin’s Urintel Drug Application after inputting concomitant medication data.  It remains a dilemma in pain management where patients with true pathologies and legitimate pain seek marijuana and other illicit substances for pain relief and anxiolytic effects. The presence of illicit substance does not necessarily negate the legitimacy of the patient’s pain complaints, but it may suggest the presence of concurrent disorder such as substance abuse or “chemical coping”. The patient must be willing to work with the healthcare team to receive treatment for both disorders; that is a decision the patient has to make.

Mena Raouf, Pharm.D. Candidate, 2016
Mena Raouf, Pharm.D. Candidate, 2016

This article was collaboratively written with Mena Raouf, a 2016 PharmD Candidate at the Albany College of Pharmacy and HealthSciences with a concentration in Nephrology. Mena moved out of Egypt 5 years ago to start pharmacy school and career in the U.S.  He hopes to complete PGY1 and PGY2 Pharmacy Residency and practice as a clinical pharmacist specialist. He is currently under the mentorship of Dr. Fudin studying pain management.


  1. Lapoint JM. Cannabinoids. In: Hoffman RS, Howland M, Lewin NA, Nelson LS, Goldfrank LR. eds. Goldfrank’s Toxicologic Emergencies, 10e. New York, NY: McGraw-Hill; 2015.
  2. McBurney LJ, Bobbie BA, Sepp LA. GC/MS and EMIT analyses for delta 9-tetrahydrocannabinol metabolites in plasma and urine of human subjects. J Anal Toxicol. 1986;10:56–64.
  3. Grotenhermen F: Pharmacokinetics and pharmacodynamics of cannabinoids. Clin Pharmacokinet. 2003;42:327–360.CrossRef  [PubMed: 12648025]
  4. Smith-kielland A, Skuterud B, Morlan J. Urinary Excretion of 11-nor-9-Carboxy-AgTetrahydrocannabinol and Cannabinoids in Frequent and Infrequent Drug Users. Journal of Analytical Toxicology, Vol. 23, September 1999
  5. Huestis M, Mitchel JM, Cone EJ. Urinary Excretion Profiles of 11-Nor-9-Carboxy-AgTetrahydrocannabinol in Humans after Single Smoked Doses of Marijuana. Journal of Analytical Toxicology, Vol. 20, October 1996
  6. Goodwin RS, Darwin WD, Chaing N et al. Urinary Elimination of 11-Nor-9-carboxy- 9-tetrahydrocannnabinolin Cannabis Users During Continuously Monitored Abstinence. J Anal Toxicol. 2008 October ; 32(8): 562–569.
  7. Moeller KE, Lee KC, Kissack JC. Urine Drug Screening:Practical Guide for Clinicians. Mayo Clin roc. January 2008;83(1):66-76
  1. Manno JE, Manno  BR, Kemp  PM  et al.: Temporal indication of marijuana use can be estimated from plasma and urine concentrations of delta9-tetrahydrocannabinol, 11-hydroxy-delta9-tetrahydrocannabinol, and 11-nor-delta9-tetrahydrocannabinol-9-carboxylic acid. J Anal Toxicol. 2001;25:538–549
  2. Detection time of drugs of abuse in urine.Vandevenne M, Vandenbussche H, Verstraete A Acta Clin Belg. 2000 Nov-Dec; 55(6):323-33.
  3. Karschner EL, Schwilke EW, Lowe RH et al. Implications of plasma Delta9-tetrahydrocannabinol, 11-hydroxy-THC, and 11-nor-9-carboxy-THC concentrations in chronic cannabis smokers. J Anal Toxicol. 2009 Oct; 33(8):469-77.


668 thoughts on “Two Puffs Too Bad: Demystifying Marijuana Urine Testing

  1. Dr. I have test after 9 days and i took one hit of Dab but i drinked 8 liter of water will i will pass the test

  2. If I smoked DELTA-8 out of a vape pen will it show up on a drug test for MARIJUANA METABOLITES, (50 ng/mL SCREEN)?

  3. I am 5’9” 235lb 42 year old male whom smoked all day everyday for years. lol have 10 weeks to pee clean and purchased a few tests that have 5 ranges from 15ng/ml to 300ng/ml. I am 2 weeks clean and still failed the over 300ng/ml. Do I even have a chance of being clean in next 8 weeks? Help!

    1. I do not think so. Hair follicle tests can go back to up to three months and if you say you are a chronic smoker who smoked everyday for years- I do not think you will pass at all. I am a 5’9 female who weighs 160 who smoked chronically for around 2-3 months and it has been 42 days since I last smoked and I am still not even passing urine tests. But- best of luck!

  4. Hello Doc, I took 2 puffs of weed 2 months ago and i never smoke weed will the results show up in a hair follicle i took yesterday

  5. So I took 5 capsules apparently between them contain 1.5ml of thc and I also shared a joint. I am not a frequent user Infact that was the first time in 6 years. I am also thin with a fast metabolism. I’m expecting a drug test when I go back to work 14 days after I consumed. I haven’t been active recently but when I go back to work I will be doing a lot of cardio. Am I at high risk of failing the drug test? Thanks.

    1. I smoked about less than .5g of Sativa on Sunday and had a random drug test Wednesday. I’m 5’9, 145lbs and I drank a over half a gallon of water 2-3hrs prior to providing a sample. What are my odds of testing lower than 15ng/ml if I rarely smoke ? I’m also kinda active with a fast metabolism. My urine was almost clear.

  6. How did my boyfriend (who smokes daily and heavily) pass his drug test literally 17 hours after smoking.

  7. Hi Doctor,
    Need your help. Haven’t smoked over 10 years ago and took 2 hits on 6/14 and nothing since then. One time use. I received an unexpected offer of employment and will be taking a drug test in the next couple of days. Should I be worried? THANKS!

  8. Hello Dr.
    Thank you for your time. I smoked a joint 24 days ago and have a drug test coming up in a day or 2. I don’t smoke often or anything like that and quit drinking a month ago, if that matters. I workout regularly and I am 5’11” 190lbs. I drink a gallon of water a day just because I always have. Do you think I will pass a UA test at a lab and if so why? Thank you

  9. Doctor,

    My friend smoked 2 or 3 times over the last 90 days, 1 puff each time. Will this show on a hair follicle test?


  10. Hey doc ,
    so if i smoke CBD that has 0.27 thc level would that produce a positive test? and what would be the difference if i smoke daily verses 2x a week?


  11. First off your site here is quite informative and appreciated.

    I am quite a heavy smoker, I smoke flower and concentrates for the last 7 years
    I’m 5’7 150 lbs. I have a pretty access drug and alcohol test coming up in the next few days. I have done a 7 day detox and have not had anything in 21 days but still sitting somewhere between 50 and 100 ng.
    Would you have any idea how long it could take to get below the 50ng level?
    Any hp is great appreciated.

    1. Ok Question ..
      I am 330 I took 0ne small hit dap pen have smokes years and i took a thc drug test said I passed .. But I hear people say my body still have 50ng thc in it how long for it hit 0

    2. Are you sweating and working out a lot of it is stored in the fat and helps if you get rid of excess fat

  12. Do disorders such as Celiac have any bearing on your ability to clear THC? I cannot find information on this anywhere.

    For example, if a person is losing a ton of weight, night sweats, etc. (regardless of the obvious need for a doctor’s appt, yes I know these are red flag health issues) theoretically shouldn’t the higher metabolism, increased sweating, inability to pull lipids and other nutrients from food…shouldn’t this make a person more likely to clear faster? Especially if they are active and hydrating.

      1. I smoked weed for a month and was told I have a surprise drug text tomorrow what can I do to get my level under 50ml

    1. Is 40 days typically enough for a “Daily user” to pass a urinalysis? BMI 31 Age 27. Smoking habit was several times a day, but never exceeding 0.5 grams for the day of medium quality marijuana. There would be periodic gaps of several days not smoking (I would guess roughly 2-4 day break every two weeks) This pattern occurred over 3-4 months and I got tired of it. Tired of being lazy, coughing, and not being myself. I’m trying to move forward in life, but I’m uncertain if it is too early to start applying for jobs.

  13. Good Evening Doctor,

    Hope you and your family are healthy nowadays.

    I want to ask you Doc, if someone is exposed frequently to second hand marijuana smoke as he lives with a roommate that smokes, would that person fail a hair follicle test. Myth says that thc traces from each exposure add up and accumulate (register) in hair and might cause a positive result especially that hair tests are pretty sensitive and can detect up to ( 1pg/mg). Is this true? And if not, why?

    Thank you so much for your time.

      1. So Doc, even though THC traces enter the body and accumulate in hair, logically speaking, they shouldn’t be sufficient to register an amount of 1pg/mg or more within a 3 months period right?

        Thank you so much Doctor for your time. I really appreciate it.

      2. Hey Dr! I have a question, I’m freaking out. I up until 4/28/20 had been smoking almost daily or every 4 days for about two weeks and stopped after I got a job offer and took a urine test on the 7th ( I used detox drink) and result came back neg. dilute… I retest in about 3 days and am barely passing home tests 50ng/dL…I’m afraid since the first one came back the way it did they may test at 15ng/dL. I feel like I should be fine but also am very scared. It’s been about 11 days since I stopped for sure.

      3. Smoked about 7 grams of flower, I weigh 225, 6’5, have a pretty fast metabolism. How long would you think I would take to clear out of my system. I smoked 7 grams in 6 days. And I have a UA in 50 days. Will I be good?

      4. hey doc,
        I recently failed a drug test for the 15 ng cutoff with a count of 18, I demanded a retest & took it 8 days later. the morning of the test I passed 2 at home 15 ng tests, but it has since been two days since I took the lab test so I’m freaking out, because typically they only take a day for negatives. my main question here is, with the 15 ng at home tests- to pass do you have to be below 15 or if I was at 15 ng would it still have passed me? I’m freaking out, considering I quit smoking for 80 days & still failed the first one. when I took the second one I was 86 days clean.

  14. I smoked this Friday of 04/03/2020 I have to take a Urine test on Wednesday 04/08/2020 I took 2 puffs an have not smoked sense will I still be considered positive on 04/08/2020

  15. Hey Doc!

    Hope you are doing well during these hard times.

    What is the effect of third hand marijuana smoking? i.e. if someone lives in a room that used to be occupied by people that smoke marijuana, would that person fail a zero tolerance ( no cut-off level) drug test? In other words would there be any thc-cooh traces in urine? Or concentrations should be 0.00 ng/ml?

    Thank you so much for your time.
    Best regards.

      1. Hello Doctor!

        Third hand smoke is an interesting topic. Some articles say that third hand smoking from Marijuana exists just like third hand from normal nicotine cigarettes. So if there is no thc metabolites from third hand smoke, the stinky smell of the room that used to be occupied by heavy marijuana smokers is composed of chemicals other than thc?

        In other words, the stinky smell (that is stuck to walls and carpets) that exists in that room doesn’t contain thc and its metabolites?

          1. Hello Doctor,

            It would be really nice if you explained why THC metabolites won’t be detectable in urine after such exposure, especially that some articles state that THC can accumulate on surfaces and can be re-inhaled as third hand smoke?

            My question is is thc included in the chemicals that result on surfaces? And if so why can’t it be detectable in urine if it can be re-inhaled. (If in case it is included in the chemicals that remain on surfaces ).

            I thank you so much for your time and hope you’re doing well and staying safe.

          2. Hello

            A few months ago I was pulled over for DUI. My BAC level was well below the legal limit of intoxication for my state. I have yet to receive the results of the “drug” portion of the test. I had not smoked marijuana in over 8 years however that night I took two small hits from a bowl. My question is will that show up in a blood test that was conducted less than six hours later?


          3. Hey Doc hope all is well, I smoked 16 days ago and I haven’t smoked for a month before that and I have a drug test today what are the chances for me to come out negative.thanks

          4. Im not a regular smoker but last week I work out time to time but I’m on probation and might have to take a drug test next week will I pass

      2. hey doc i took one hit and the smoke was very lightly
        mind u it was a bong hit but not huge at all very small hit i didnt even clear the whole weed . how much time do i need to be clean ? especially since i drink water everyday and fast metabalism .

  16. Hi if I took a big hit out of a bong and I weigh 165 how long will it take for the thc in my system to disappear

  17. Hi, if I understand correctly, if I use cbd oil (supposedly at 0.3 %) heavily for a couple months. Then I will test positive on a urine lab test? If so how long will it take to get out of my system? I am 5’11 160lbs and don’t exercise at all.

  18. Hi doc I have been a medium smoker for 10 years . About 1 joint a day. iv recently stopped for 23 days and my home test is showing a faint 2nd line at 50ml cut off . Is that a pass? And if I have 1 or 2 puffs today will I be over the cutoff and for how long?? I weight 80kg and have a very fast metabolism

  19. Hello Dr. Fudin, I am a medical student at SGU, I tested positive for THC while at schools and have been put into a monitoring program because I was less than agreeable when I said that I had a card to use THC. I have passed 3-4 50 ng/ml cut off tests. I just passed one today.

    Last week, maybe 3 or 4 times, to sleep I used some expired (2017) charolettes web CBD which has a very low THC content. I was randomly selected for a drug test yesterday with the THC cut off being 20 ng/ml. I haven’t smoked since December and all prior tests, including the one today have been negative. (50 ng/dL) Do you believe that the few uses of CDB will cause me fail to at the 20 ng/ml range. I am freaking out honestly.


  20. I smoke a couple if puffs..maybe 6 to 19 puffs on New year Eve leading to New year’s day and I have a job today & they will drug test me..will I be okay? That was my first time smoking.

    1. Absolutely. If that is the only time you smoked. Obliviously your drug test has passed given the date. Let me know how it went for you.

  21. Hey Doc,

    Great article. One question for you, what is the conversion rate of Delta 9 THC to metabolite. In other words how many ng of metabolite will you get from an *oral* mg of THC?

    I’m trying to calculate max metabolite levels based on daily oral CBD use. The CBD is full spectrum and contains 2.34 mg/mL THC. I use 1 mL morning and evenings for anxiety and pain control.

    Full spectrum works better for me, but now I’m concerned about the amount of THC present.

    Can you help?

    Thank you!

  22. Thank you for the excellent article. Question: will 30mg of thc intake (2 – 10mg gummies & less than 1/2 of a joint taken over 5 days) likely show up as more than 1 pg or POSITIVE on a hair follicle test ~60-70 days later?

      1. I took one dab from a stizzy about 5 seconds long. How long will it take for the THC to not be in my system completely because I am taking a drug test next week? I need answers!

        1. Depends on you metabolism to be honest. Thc sticks to the outer layers of fat so if you have that kind of time I would say exercise and drink lots of water to flush it out as it burns. I am not a expert I only speak from personal experience. If you are truly worried i would recommend a worthy detox drink you can get from GNC or another vitamin shoppe near you, especially if your not a heavy user this should pan you out for a successful win. But don”t quote me for your own experience and others will deny the detox drink but like I said I speak from my own personal experience

      2. hello Dr. so pretty much I haven’t smoked weed is 6 years and last Wednesday I took two hits of medical marijuana. I had a test today the 9th and I’m still nervous. Based off your research I should be completely fine, right?! It would’ve been out of my system in 3 days? I also drank tons of water the first 5 days after I smoked. Please ease my mind

    1. I took 1 hit (approximately 2-3 seconds) 25 days ago. Prior to those 25 days, It had beens approx 2 months since I last smoked. Typical usage was 1-3 hits per week for a month or so.

      Test is tomorrow, and there is a chance it will be run as Gc/ms 15ng threshold.

      Been passing home tests 50ng threshold for the past week.

      Chances I will pass below 15ng??

  23. I took 3 hits of moderately potent marijuana on Feb 2. Prior to that, I had taken maybe a total of 4 hits earlier in January. I was urine tested on Feb 9. I feel like my THC levels were pretty low if not undetectable prior to Feb 2. Would those 3 small hits on Feb 2 cause my test on Feb 9 to come up positive?

  24. Hello Jeff I love this site you provide a lot of information in reference to THC intake, and how it can affect drug testing.

    From 2017 to 2019 I was a heavy smoker. Smoking 4 to 5 blunts a day. Within that time frame I may have taken 3 to 4 drugs test and passed everyone. I even smoked hours prior to taking the test on a few occasions. How can that be possible??? After I got a job. in corrections in Sept 2019 I stopped smoking. From Sept 2019 until Jan 2020 my consumption of Energy drinks increased a lot to help me stay awake working overnight. In Jan 2020 I was officially offered a correctional officer position in another state. I passed a drug test for this position in early December. After leaving my previous job in late Jan 2020 the 31th to be exact I celebrated with some friends and smoked for 3 days straight smoking 3 blunts a day before relocating to start my new job which was supposed to start Feb 10th. The company told me I had to take another drug test (which was unexpected) because my previous test expired. I took another test on Feb 4th and for the first time I actually failed. Did the consumption of energy drinks have any effect on me failing this test?

        1. i took two hits of a joint 6 days ago and i ate an edible but threw it up like 20 seconds after remembering i had a drug test 3 days from then will it still show up

  25. So I smoked a day ago took 2 small puffs I haven’t smoked in 3 months. I took a 50ng drug test today and passed it do you believe I will pass a 20ng one in 5 days?

  26. Hello, a friend offered me CBD in dry flower form tonight and I was dumb enough to smoke 1 “hempette” cigarette and took 3 hits off of a pipe (clean pipe, no previous marijuana use) before researching that there are trace amounts of THC in these products. I’m now aware that there could be any amount (more or less than the legal limit of 0.3%) of THC in these products, but I have a potential job offer coming up. I don’t know when they would complete the urine analysis, if I even make it past the interviewing stage, but I am highly concerned now that I may have mistakenly messed this opportunity up. Would the much lower amounts of THC in these products compared to actual marijuana last the same length of time in the body? I have found a lot of reports like yours here saying around 3-7 days for Marijuana to be detected in urine from one time use. Also, if I end up having a positive drug report for THC because of this one time hemp CBD use, is there anyway for the labs to verify I only consumed legal CBD and not illegal marijuana? If so, would they report a negative drug screen to employers? I’m not a drug user and would really hate to be punished for trying something once that is totally legal 🙁

    1. Michelle,

      Here are the answers to your questions…

      Would the much lower amounts of THC in these products compared to actual marijuana last the same length of time in the body? They last the same amount of time, but a lower dose will not be detected in a shorter period of time. Half-life of drug is the time needed (in hours) for a drug to reach 50% of the previous concentration. A drug is out of the body in 5 half-lives For example, Lithium has a half-life of 24 hours. If the concentration is 10ng/mL now, that means there will be 5ng/mL left in 24 hours; in 48 hours there would be 2.5ng/mL. So if you start out with a low amount, it will be a sooner time until it is below the measurable threshold.

      I have found a lot of reports like yours here saying around 3-7 days for Marijuana to be detected in urine from one time use. Genrrally that’s tru.

      Also, if I end up having a positive drug report for THC because of this one time hemp CBD use, is there anyway for the labs to verify I only consumed legal CBD and not illegal marijuana? No

      1. Hello Dr

        This question is going to be a bit different from the ones you see on here:)

        I am an 195-200lb guy with a very low BF % of < 10%. I took a CBD "gummie" that unbeknownst to me, had 5mg of THC in it. I NEVER use weed because I hate it, and you could say without a doubt, that this was a single one time use of THC. However, I use CBD quite often for pain. I hadn't used it much prior to the "Gummie," but I use it regularly. I have taken home drug tests for the past week and Im NEGATIVE @ the 50ng level. I had a drug test yesterday for a very high paying job and Im still stressing out like crazy that maybe I could still "pop" positive because I do not know what level they are testing down to. I took the "gummie on Jan 28th and had the test a week later on Feb 4th, yesterday. So roughly 7 days between taking the gummie and the test. I think Im in the clear for a 50ng test obviously, but if for some reason it goes down lower, do you think I could potentially test positive at that level. I started the testing literally the day after I realized what I took, so on Jan 29th. I started to show CLEAR/NEGATIVE tests about 1-2 days after, so on Friday or so. They got more definitive each day of course. Im probably freakin' out for no reason, but this is a big job and too lose it for such a dumb ass fuck up, I would step in front of train…kidding of course.

        Looking at the graph you posted above for the "test" subjects taking 27mg of THC, My dose was 5 times less. But it was orally ingested, not smoked. Oh and Im 50 years old.

        Hopefully I gave you enough info to give an educated guess.

        This is a great site btw.. I learned a ton. Thanks and keep up the great work.

          1. I had about 3 puffs on January 30th 2o20 and today I had a random feburary 10th I haven’t smoked at all in February just that one time on January 30th do you think my test will be positive I. Going crazy because I just got this awsome job please…let me know

  27. Hi I have a question so basically if your a chronic user your level of of intake is always going to be high correct for example let’s say I smoke 10 blunts a day an I get a drug test an I’m 4x over the legal limit but smoked yesterday witch I smoke 10 blunts a day won’t I always be over the legal limit because I’m a chronic usher

      1. For an example if I was to drive an got pulled over an was tested with a urine an they said I was 4x the legal limit but the last time I had smoked was 12pm an let’s say I was pulled over at 10:30 pm that night wouldn’t I always be over the legal limit if I’m a chronic user smoking around 7-10 blunts a day with each blunt containing about 1.0 / gram of marijuana in it an that’s 7 days a week I smoke

        1. Maryssa, Urine levels are not a valid indicator of how much drug is in the body for various reasons. For that you need a blood sample. Irrespective, if you are using marijuana regularly, YOU SHOULD NEVER BE DRIVING, as it puts you in danger and other drivers in danger.

      2. I just smoked yesterday I took 2 puffs and I did a 50ng drug test and passed it barely do you believe I will be able to pass a 20ng in 5 days? I’m 160lbs..

  28. Im 35 years old im about 215lbs I stopped smoking October 2019 i took 2-3 puffs of marijuana on Jan/17/2020 today it’s 1/28/20 I have a drug test tomorrow or the day after.. I workout a lot and drink a lot of water can i pass that drug test??

    1. can can be out your system in 24 hours if you dont smoke everyday just buy your own kits and test yourself at home

  29. Hi I am 5’7 and 172 and my BMI is 15.5 I took two puffs of weed and had a random drug test exactly 11 days later. There was nothing in my system prior. I work out a lot and lost 8lbs within a week before the test and drink over 90 ounces of water a day and passed an in home drug test the day before. Is it possible I passed? I am not going to jeopardize my job again!

  30. I posted last night asking how long it would take for me to clean out, to find my question deleted? One hell of a website you’ve got here. Such helpful, much dogshit! WoW!

    1. Quite possibly you should realize how much stress you are currently dealing with since you are using a substance that the majority of the public and almost ALL employers frown upon. If you are trying to get a good job that is dependent upon a clean drug test or avoiding punishment by law due to a positive test then you should simply REFRAIN from your drug use. As Doc stated; he is not here to help you ( or ANYONE else out there for that matter) pass a drug test. Educational material has been provided and both individuals have provided accurate and helpful insights. Take what you want from this forum; however, for you to call it “DOG SHIT” and to post your name as ” PISS OFF” is CLEARLY indicative of your lack of CLASS and intelligence. Just stay away from drugs and you won’t have to worry about failing a drug screening.



  31. I’m about to go on a trip to California for a week will be back before February, if I smoke the whole week out there and have a probation drug test of March the 3rd is it possible to be clean by then?

    1. 2/3 for Drug Tests
      Passed 2 UA (1 was 5 days after smoking the other was 6-7 hours after smoking)
      I was a frequent smoker for the first test and a chronic smoker for the second one. Both tests I just took a multivitamin and lots of water.
      3rd was a mouth swab and I failed. ~36 ng/ml (was still a chronic smoker and smoked the night before and morning before work appx 12-13 hours before). No prep for it. Nobody to blame but me.

  32. I’m 23, 6’3, 240 lbs. used to smoke once a week for a few months but haven’t smoked for a year and a half now. If I smoked low grade weed one time, how long would it take to pass for a 15ng/ml test

    1. We are in a similar situation and similar weight and height, I’m trying to find a solid answer myself, what I was told is it will take people like you and I 7-10 days to get clean from just a one time use but I’m not sure that’s why I haven’t smoked myself because I’m not sure if I will be clean 5 weeks from now from just a one time use

  33. Hi Doctor! I’m a non regular user. I’m a 5’2 female that weighs 140lbs. I last smoked January 5th but prior to that was clean for 2 months. I only took 3 hits from a pipe. Do you think I’ll be clean for a drug test in two weeks?

  34. Hello I have not smoked in over 5 years and an on December I smoked about 3 grams of marijuana and then a week later on December 14th I ate half a chocolate edible. Is 26 days enough to be out of my system? I am 5’8 about average built and 170Lb’s

  35. Does CBD taking CBD supplements/Oils Help when avoiding a THC positive? I’ve read that CBD is counteractive to THC. I haven’t smoked weed in about three days (I’d smoke a blunt once a day) and about to buy some home drug tests at the local Walmart (Do I get it from the pharmacy or is it in one of these aisle?)

    So it’s been three days since I last smoked weed:
    When Should I take my drug test for this job?

  36. I am a 5 ft 1in tall female. Approximately 165 lbs. I quit smoking weed completely on 12/22, was a heavy user. I used a 7 day detox program the week of christmas. Not into much exercise. I tested positive at 50ng/mL for thc my last home test on 1/2. I have been drinking lots of water, some tea and coffee. How long will it take to get clean enough to pass a urine or blood test? Any suggestions appreciated also.

      1. How long will one or two bong rips of decent weed stay in my system I’m 6ft 250 pounds and I’m 2 months 3 weeks clean and test negative just wondering how long that will stay in my system because I would like to take a rip or two

        1. It depends on the amount you inhale and the quality of the pot. It also depends on your metabolism rate. Since thc is stored in fat cells being overweight increases the length of time the thc stays in your system. I would say it would be detectable for 7-10 days. Buy a good quality home test kit.

      2. Hi , sorry to jump on the post, I used to smoke for years, on the 3/10/19 I stopped smoking I went for blood test for driving on about 49 days later and still had 72 ng/mg in my system would you think would be clear by now?

      3. I’m not a frequent user. I smoke maybe once every 2-3 months and it’s 2-4 puffs. Would I be clean if the last time I smoked was unfortunately 12 days ago and I have to pee. Would I be clean??

    1. Hello, if you were a heavy user, you will need atleast 35- 40 days in order to get clean after chronic use (speaking from experience). No matter how much water you drink, this will only dilute your pee and eventually thc will show up again. I suggest you eat foods that contain high fibers and try to exercise. (Sweating and pooping will definitely help your detox progress)
      Also, try to take your test when you are completely rested because taking it after exercising might spike up these levels again.
      Best of luck !

  37. i havnt smoked and 2 months 10n day and my thc level was 475ng/ml how long would it take for me to be clean

  38. If someone is prescribed adderall and they take 2 a day and smoked 7 hits in 7days would the adderall help in the cleaning the THC out of your system since it does speed up your metabolism? Thanks

  39. Hi im 6 feet 150 pounds male and im skinny. on 10/29/2019 i smoked ten hits of thc concentrate out a vape pen and havent smoked 3 months prior but i have to take a 15ng lab test 1/10/2020. .
    i took a at home test and it came out negative but its 50 cutoff. im sure the concentrate stays in the system longer so what is the chances of being below the 15ng cutoff?
    i guess im wondering does thc leave your body slower as the ng/ml get lower? and also how much of a difference in time would you say it takes to go from 50 to below 15ng?

  40. Hi I recently took a drug test for work that had a 50 ng/mL cut off and I haven’t smoked in almost 5 months and was a moderate smoker maybe 4-5 times a week depending on the week. Is it possible that I will pass after almost 150 days of being clean? I’m 6’1 210 pound male.

          1. I haven’t smoked since the beginning of August and I’m a weight lifter so I workout at least 3 times most weeks if not more. I sweat a lot and my body fat % is lower than 20%. Is it still possible that the test will come back positive?

          2. It is very doubtful it would be positive if you haven’t used any since August, but it does in part depend on the quantity, concentration/dose, and length of time you used it, especially if it was used chronically.

      1. So it takes 21 days for a single use/ bowl pack of weed to leave your system? I haven’t smoked in almost 3 months I test negative but I would like to smoke a bowl and was wondering how long it will take for one use to leave my system I’m 21 6ft 250 lbs

      2. I just wanted to thank you for posting this and answering everyone’s questions!

        Not sure if you will see this, but I wanted to ask. I am 34 year old 270lb male and I take 25mg of Adderall XR per day. Was clean 3 months and smoked a couple of bowls on 2/1 and 2/2 (16 days ago) with a friend. How long do you think that would take to clear out of my system?

        Thank you again for this!!!

    1. It has been gone.If it was only 2 puffs into a 100% clean system.I take a urine screen every week.I have not failed yet.Well for Thc I haven’t ..Cocaine I failed 3 times.It is best to be sure you have at least 6 or 7 clean days between tests for it.I gambled like an idiot with 4 days.Busted,Lol. I smoke herb one hit maybe 2 sometimes 3 if I have a week.In between.I take small hits and it is fire. but I then wait until my screen is clean, to do it again and some weeks I dont even take a puff..The people that smoke a lot it builds up in.I don;t hold it in and I don’t smoke it everyday.Ppl keep saying your gonna fail lol ,But they do not realize.I hit it then wait.Until my test comes back clean to take another hit or 2.Luckily it gets me high since it is good herb.I would bet cash it is gone.I know it is unless it was more than 2 hits or there was some already in there.Now if you smoked a few joints your fucked.

  41. I am 21 and I am 5’1 and I got a urine drug test and cutoff=50 and my results was positive and I had a cutoff 15 and I failed it why is that?

    1. I can’t answer this without knowing all you prescribed medications, what you have taken (if anything) that isn’t prescribed, when the doses were last taken, and the dose taken.

  42. Im 5,8 148 pounds body fat 13% male i vape weed or thc twice a day for two months going through 3 1 gram carts in that period of time i exercise decent amount will 57 days be enough to pass a 20 ng drug test

  43. I was a daily smoker until I stopped smoking 17 days ago and have passed 3 different at home take home tests at 50 ng/ml for the past 5 days. The lab i test at is 40 ng/ml. Do I have anything to worry about?

    1. Good afternoon,

      Was a frequent/heavy user for years have been abstaining since October took 2 vape hits on Christmas, got several at home tests presumably 50ngl all passed. Had a physical for new job 2/6 now 3 weeks later I find out I need to redo drug test. Unsure why there was several others that also had to redo. On Feb 15th I took a hit of a vape and 2/22 took a very small bong hit. Now redo I’d 3/2. If it’s 50ngl I think I’ll be fine especially with such infrequent use but if it’s 20 I’m a little concerned will be over a week so I’m thinking probably okay but wanted a secondary opinion.

  44. On 12/6/2019 I smoked 3 small non-full inhales from a blunt, it was only my second time smoking ever and first time in more than a month, and I did get mildly high from it. I have a job interview 12/17/2019, could I test clean? I’m 6’2 and about 150 lbs

  45. I smoked 3 weeks ago and was an occaisional user. I was offered a job and had to take a urine test and failed. I have drank tons of water, used several detox programs, and 3 weeks later, my home test is still POSITIVE . I am not overweight and 5 ft 4, 125 pounds. I eat very healthy. I have to take another urine test Tues and if it is positive they are offerring this job to someone else. Do you have any advice!!! Why am I still retaining the THC ?? Everyone says it takes a week or so if you were a light user. Do you have any “argument” or facts I can propose to the HR person to let me wait a few more weeks to retest??

      1. I can’t figure out how to make a new thread, my apologies for commenting as a response. I occasionally, and by occasionally I mean once every few months or longer hit a friends pen or take a bowl hit. However I have also been using CBD oil daily and I was told it has a small amount of THC, it’s American Sharman which I thought was a reputable brand of CBD oil. I had to take a drug test because I take adderall and my drug test results came back as carboxy 23 ng/mg creat, could this result be because of the CBD oil, or is that number too high? If they take my meds I’ll be in a mess , ugh. I’m so mad at myself.

        1. Carboxy is to compare old use to new use, so you need the THC level. Yes, many CBD products contain THC. Technically the allowable legal limit is 0.3% or less, but it is not properly monitored by any regulatory agency such as FDA.

          1. I’m not able to make a new thread Either but I am 2 months without smoking as a heavy smoker and I test clean with at home test and my drug test isn’t until January 6th 2020 my question is would I be able to smoke a bowl pack or even a couple puffs and still be able to test clean by janauary 6th 2020

          2. I took 2 CBD capsules that were 0.1%thc , who would of thought 0.1% would even show up . I was dirty for 2 days, clean on the 3rd .

  46. Im a male, weigh around 130, and have a high metabolism. If I smoked 3 days ago after a year of abstaining, will I pass a test today with heavy dilution?

      1. **UPDATE: I passed my probation drug test. I drank a ton of water during the three days, and within the couple of hours before. Again, I have an extremely high metabolism, and I had abstained for about a year prior so that was honestly the reason I passed. Also, as much as I love to smoke, the stress of worrying about the results wasn’t even close to being worth it. If you’re in my situation, I wouldn’t risk it. Hopefully this helps someone in the future.

        1. Man I appreciate this post I’m currently on probation and I smoked maybe a G I took a at home dollar tree test and I passed but you know how probation is they send it too the lab so I’m hoping I’m good I find out today 🙁

  47. Hello I am a single time user smoked on 11/10/2019 and I have a drug test on 12/6/2019 for a job I really want the cutoff levels are 50 ng/ml and confirmation 15 ng/ml. I never really smoke will I be able to pass my drug test. mind you I have passed 5 at home drug test flying colors just really scared to fail this screening.

      1. Hi,
        If an edible was consumed over 60 days ago (didn’t get high from it) and the last time smoking before that was August will a hair test be passed? Very infrequent smoker/ edibles.

    1. yes i do it every week if u test clean then wait until the next week i do it weekly .These ppl are guessing i do it weekly failed for coke never weed i take a small hit or 2 and wait a week until i do it again.I dont hold it in until i turn blue either just like a cigarette puff

  48. So I got hired on the company I was wanting to be hired at, I stopped smoking two weeks ago and only smoke on the weekends. I am 5’2 123lbs, some days active some days lazy as all get out. Think I’ll clear it? And also, if you smoke on just Fridays only, could you clear a test within a week?

      1. 18 days since smoking. Typically 4-5 days week 1-2 hits of a bowl. I exercise and sit in sauna 5-6 times a week. I drink 1.5 gallon(s) water daily. Drug screen is for 50ng/ml. I’ve passed two home tests. What’s your verdict? Thanks for your time!

      2. Hi i smoked 4 or 5 hits on decmber 26, first time smoking in years. How long would it take to clear my system? Unrin test.
        Thanks for your time.

  49. Hello,
    I smoked 3 hits off a vape pen Saturday night and got hit with a random UA at work Tuesday morning. I’m 5’3” 210lbs female, and I haven’t smoked in around 7 months before this time. My urine was pretty clear in the test cup, it was an eCup test. Do you think I passed the test? Also to note, I took 2 at home tests later that night and passed both at the 50ng level. Thank you!

  50. 5’7″ 200lb female
    I have a drug test for a new job tmro. I passed a drug test on Sept. 5th and only smoked once since then, a week and a half ago. How likely is it that I will pass this drug test?

  51. Hi Doctor,

    I am a female, 33 years old (158cm, 50kg”, i smoked 3 joints of Hash on Thursday and i have a test tomorrow “thursday”.
    I have been drinking loads of water and trying to workout for the last 2 days.
    Will i pass the test?

  52. Hello Dr. Fudin,

    Would like your help please ! I am 28yo, 150lb, fast metabolism. I smoked 2 small hits from a “gravity bong” on Oct 19 approx 10pm, i then had a surprise drug test on Oct 23 at approx 2pm. I took 2 at home tests on the day of the test and passed at 50ng/ml. The problem is I take Adderall, very small dose 5mg instant release and not daily more like 3 times per week. I took a dose the day before the exam. My concern is that I will test positive for amphetamines (screening cutoff is 500ng/ml) and then on confirmation be positive for thc (15ng/ml cutoff) . What do you think? I’m pretty sure I took 2 at home tests 2 days after I smoked, 1’.5 days before the test and I was negative for THC. What are your thoughts? Had not smoked any marijuana in months prior to this 1 time. I’m freaking out!
    Thank you

  53. Dream job lost. I’m 54 and 215 lbs and 5’6. I’ve lost 50 lbs in the last year and a half. I smoke oil and no flower to aid in sleeping. With my young teenage daughters around I figured it’s time to stop and use non thc based meds.

    I have not smoked at all l for 4 months. But smoked nightly prior to stopping cold turkey.

    I took a thc test for employment knowing I would pass. They tested for 15ng and I tested positive at 33ng. I’m blown away and can’t explain this result. I only know that I was let go as their insurance company sets the rules as this is a smaller company trying to secure the best rates for their employees.

    So with all that I read, even a daily or nightly smoker of oil or pens should not test positive past a couple months.

    They will not allow a rest even if I pay for it. The rules are the rules! If you are heavy and a daily smoker you might want be concerned.

    The CBD product I use orally has 1.67mg thc which I hadn’t used in 2 weeks. And I still failed this important test losing the job.

    Crushed and confused. Can this be explained??

      1. Hi there I could not see where to post my own question so I do apologize for posting on a reply. I am in the same boat as a few others and a bit worried and confused. I haven’t smoked marijuana in almost 10 years, well recently I have been under alot of stress and on 10/25/19 I smoked a half of a joint (regular marijuana, nothing strong or special) instantly I regretted it of course. One of my friends introduced me to CBD flower which contains
        THCA: 0.050%
        DELTA 9 THC: 0.110%
        DELTA 8 THC: 0.000%
        TOTAL THC: 0.160%
        CBDA: 2.800%
        CBD: 13.400%
        TOTAL CBD: 16.200%
        It has really been helping me with my stress, anxiety and pain and I love that it doesn’t get you high like actual marijuana so I have been smoking 1 joint per night to help relax from the day. Well I have given myself multiple drug test that have a 20ng break point and I am continuously failing for THC. It is now 11/08/19 and I am trying to figure out if it is the half of joint I smoked or the CBD flower I have been smoking that is causing me to fail the drug tests I am giving myself. I am alittle on the short and heavy side 5’3 150lbs so I know it will take longer for the marijuana to leave my system but it seems to be building up instead of leaving. When I first tested myself after smoking the half of a joint it was positive but I did see the negative line faintly, now it’s not there at all. I am not familiar with the levels in CBD products and what levels I should stay away from to keep THC out of my system. The reason I am testing myself I have had two major back surgeries and have to go to a pain management doctor and if they drug test me and I fail I will lose my medication. I would like to continue using CBD flower as it helps with pain, anxiety and stress and is a more natural alternative than prescription pain and anxiety medications but I do not think it would be safe to convert all at one time. Please if anyone could help me shed some light on this situation and help me figure out if it is the THC joint I smoked or the CBD flower that is causing me to fail my home drug tests. Thanks in advance!!

      2. I took about 5 puffs of weed on the 6th of November, I have a drug test that’ll guarantee my admission into the University on the 19th of November. Do u think I’ll test positive to the confirmatory test of 15ng/ml. The last time I smoked was 3 months ago and it was only half a stick of weed.

    1. Hey I’m not really familiar on how the thc levels work. So I was drug test and the cut off was 50. Is that positive or negative. Or maybe means that I was in the middle of both ? I’m so confused please anyone help

      1. The cut-off is a number below which a test cannot measure, and above which it can. For example, if the cut-off is is 50ng/mL and you actually have a level of 48ng/mL, it will not test positive because the test is not sensitive for below 50ng/mL. If your true level was 52ng/mL, it would show up positive.

        1. Hey Doctor

          I’m 22 years old 5”11 weighing 235 Ibs and I took a drug test with a 50ng/ml bases and it came back positive at a 47 ng/ml how long would you think it take to get out my system can it possibly be a month ?

      2. Hey I was wondering I took one hit of a moderately strong blunt on Friday after not smoking for 3 months, will I pass a drug test tommorow? I’m 5’10 and 140lbs

  54. Hi Doc and helpful MJ users!

    I am female. 140 pounds. 5’5”. I have not ingested marijuana for over 5 months prior to Oct. 12, when I took two puffs of a weed vape pen with 85% THC. I do not think I inhaled correctly because I did not feel high at all and it was my first time smoking from a pen (I prefer edibles). I found out I received an offer for federal employment a couple days ago. I now have to take a drug test tomorrow morning. I know it is going to be the 15ng standard. Will I pass? If I fail, Ii’m screwed from ever getting this federal job ever in the future, Should I not show up for the test at all and be eliminated from consideration? Someone please help!

    1. This may be too late….. but just in case… or to help others in future I will post anyway. You could always purchase an OTC (over the counter) home urine drug screen test from a pharmacy and take it to see what results come back, then base your decision off that. For the most part, I would think if you pass one at home, as long as it was done properly and strictly by the directions…. then you would likely pass the official one…IF it were also a UA drug screen. If ever unsure as to whether you will pass a UA drug screen at ANY point in future…. be it a job, whether you are that interested in the position or not, or a UA drug screen for any other purpose…. if uncertain, then do NOT take it. Period. Those results can come back to haunt you in MANY ways in the future. Even if it means you will lose the chance of landing your dream job…. if unsure as to whether you will pass one, then do NOT take one. It’s. ALWAYS much easier to explain how you carelessly had forgotten test, run too late on time, Trust me…. I would rather they got mad at me, wrote me up…. whatever they felt it called for…. just DON’T Jack with my money’s……… OR my career!

      1. Thank you so much for your response Reagan. I took the at home tests (6 to be exact) and I went to a clinic to get tested as well. All of these tests were under the 50ng standard and I passed. I was unable to buy a 15ng standard test in time or get tested at a clinic with this standard. I ended up taking the test. I will update this thread with the findings once I find out.

    2. Just wanted to give an update: I PASSED. they did not notify me of my results, so I cannot share that with you all but I know that I passed under the 15ng standard.

  55. Hi, I’m 5’1″, 108lbs and I workout (pretty hard – cardio based) about five days a week consistently for about a year and half, at least. I eat pretty healthy, and haven’t touched fast food in years, though I enjoy a cheeseburger or two occasionally. I was a heavy smoker for three years (since 2015), but only smoke at night now, since last September (was 2018). and especially the last 2 – 3 months, maybe smoking 1 – 2 bowls a night, if that. I don’t really smoke joints anymore, though the last time I did was maybe 5 – 7 days ago. the last time I smoked was gently hitting the bowl two nights ago. My test is the day after tomorrow. I worked out yesterday and this morning and planning to workout tomorrow morning, but maybe stop the day of testing. I’ve been drinking more water than I usually do. have you any advice to pass the test? am I gonna be okay for the test? thanks!

  56. I took 3-4 puff on Friday evening and have to do a random UA test Monday afternoon. Any way I can still test positive. I’m 5’5 and 195lbs

    1. Keep in mind the bigger you are, the longer it will last in your system. Not height – weight, It stores in fat cells. I would try Quik Fix – money back guaranteed and it has ALWAYS worked for me. Just better safe than sorry.

  57. So, I am one of the folks who use drug testing as an employer (Urine, 20 ng/mL). Several have claimed CBD oil usage is to blame for testing positive. (1.3% is legal in this State). The CBD oil shows 1.3% thc on the label but I am well aware that this is not regulated. So when a prospective employee tests 53 or 48 on a 20 ng/mL test….could they (prospective employee) be right?

    1. Steven, Yes they can. Because this problem has become so prevalent, I will soon be collaborating with some of my PharmD colleague who are manufacturing their own CBD products that are guaranteed to have 0% THC.

      1. Thank you. Is there any steps being taken to regulate production of CBD oils and its contents? It is certainly awkward taking definitive steps from a hiring manager when faced with confusion regarding THC and positive testing results from what, I am told, is due to CBD usage.

        1. Steven,

          The only steps the government has taken is to tell manufacturers that the THC level needs to be 0.03% or less, but there is no monitoring, so many products have more than that. Very few have 0%.

      2. Hi I really need your help. I never really smoked pot. But one June I smoked a few times. But July from the July 1st until July 19yh I have smoked a few times again. I have not had anything since July 20 the. I go to pain Management August 12 I will have a urine test . Will I pass after 24 days of having anything in my urine. Very worried thank you

  58. Hello.

    I was a chronic user, but stopped smoking for about 6 months. About a month ago I took two hits from a vape pen. I have a urine drug test next week for a new potential job. Do you think it will come back positive? I’m 4″9, 120 pounds.

    1. Absolutely not. I smoke once a week on Sundays. I get drug tested on Fridays and Sundays and pass every Friday, ive varied on amounts, dabs blunts joints, even 2 blunts and done dabs and passed Friday morning. You’ll definitely be fine.

  59. I am having shoulder reconstructive surgery in 2 weeks. I have been in pain management for over a year, and have failed a test before, unintentionally, by using CBD patches (I don’t even LIKE THC, it makes me have panic attacks and heart palpitations, but CBD helps with the inflammation in conjunction with the medications and supplements I take) that just happened to have THC in them. I have never missed an appointment, and have a very good relationship with my doctor overall.

    I bought a product at a CBD store that supposedly only has “.1%” THC, which I have been using every day, about 2-3 grams per day – Mostly as a tea, but sometimes smoked out of a bowl before going to bed.

    I have been using this product for approximately 3 weeks, and I have an appointment with my pain management doctor the day after tomorrow. I just tested myself and was astonished to find that my levels of THC were somewhere between 20-50ng/ml. I’m scared that I will lose my pain management, regardless of what I do – If I tell them/bring the label of the product in question, they may cut me off right then and there, whereas if I don’t tell them, and I test positive, they’ll cut me off when I’m 2 weeks out from surgery next month.

    Do you think that large amounts of water and cranberry juice to flush my system will eliminate enough so that I can be sure that my drug test will be negative? Or should I reschedule the appointment for next week, ensuring this?

      1. Thank you for the prompt response! No, my doctor is supportive of CBD use, so I shouldn’t have a problem, I don’t think.

        Thank you for doing what you do. I can tell a lot of people here are just trying to get high as much as possible without facing any ramifications for it (which isn’t THAT bad if you work in a fast food industry or other job not requiring skill, dexterity, or focus ; But I sure wouldn’t want my kids’ school bus driver or my surgical nurse toking up right before going on duty)….but you handle their questions well, regardless.

      1. Go to the blog of your choice, in this case probably Two Puffs Too Bad: Demystifying Marijuana Urine Testing, scroll to the very bottom of the page, and you’ll see directions to fill in for comment.

    1. While using home test kit with a cut off level of 50ng/ml for THC., if I see THC results of 229ng/ml, does concentration help us to draw a conclusion on usage? Does this concentration indicate how much of a daily usage or occasional usage or any thing similar?

  60. Hey Doc, I hit a wax pen about 5 days ago, (I thought it was a nicotine device) and I have a drug test Oct 21st for a pre employment test of a receptionist position. I am 5’9 and 170 pounds. Before I hit it I hadn’t smoked for at least 2 months before that (on purpose that time). Do you think I can make it?

    1. You can absolutely dilute your system and come up clean. Water is fine, cranberry does nothing different except it’s a diuretic and makes you pee more which is good. Most tests cut off is 50ng for thc if you’re below that you’re good but if you want to be extra safe drink and pee A LOT before the test. Do not give your first pee of the day this contains the most metabolites, pee as much as possible until its clear like water and when and you provide the urine start going outside the cup and catch it midstream then pull the cup away before you finish the beginning and end of a sample have more than the middle of the sample. Also do not admit to anything, you’ll most likely be fine. If you admit then are clear in urine you would have admitted for nothing. Deny until the end.

  61. Hi
    I was a heavy smoker for 4 months. I then cut down to smoking once every 2 weeks for 5 months. How long will it take for me to detox? I weagh 168 pounds, am 6’4 and I exercise 5 days a week.

    1. hi doctor,

      I have smoked once in the last 9 months. Before Last night. I took two hits of a bowl, and when i tested myself with an at home test 6 hours later it said i was clean. How could this be possible if i smoked two hits that same night?

  62. Completely disagree with this. I consumed an edible that was 9 mg of thc. I tested positive at 20ng for four weeks and I use less than three times a year. This is complete subjective of a persons body chemistry and other medications. The person n this scenario very well could hav3 been telling the truth depending on how potent the strain was.

    There needs to be a LOT more research done before this can be applied in practice

    Also thc free CBN products will test positive., as will certain CBD products. I have done these tests just to see the results.

        1. I’d like to know what level of ng/mL a chronic user, and an occasional user would be. I’ve heard that everyday about the level drops approximately in half.

          1. I must not have made my original question clear. How much ng/Ml does a chronic user have in their urine as he is a chronic user? How much ng/Ml does an occasional user have in their urine?

          2. Jefflynyrd, It is too variable to answer. But generally, and occasional user will have less than than 50ng/mL depending on last time they used. A chronic user will have more than 50ng/mL. But again, it depends on the product, how it is ingested, last usage, and hydration.

          3. Ok. I get where you are coming from…. I’m speaking more of generalities… if I burn say, 2 joints a day for a month, where would I be…. and then if I smoked a joint once a week, where would I be… I am not concerned about the 50 ng/ml level at all.

  63. Hi Dr.
    I am 27 years old, 6ft, 270lbs. I used to smoke daily but stopped that years ago. I now smoke minimal amounts (1-2 hits at a time) once or twice a year. This time it just happened to be 5 days before an unexpected test. I took ONE hit and have been drinking a ton of water. Is there a chance I will pass a test on Tuesday if I had the one hit on Friday?

    Thank you!

      1. Thank you for your response! Are you fairly confident in this even though I am overweight and the THC stores itself in fat cells?

      2. 100 ng/ml thc was in my system on 7/24. I still smoked till about 8/7. Will i pass the test I just took on 9/18? Also how long would it take to get 100 ng/ml down to 0%?

  64. USADA has an new threshold for carboxy-THC to be present in an athlete’s urine over the Decision Limit 180 ng/mL. That seems high. For athletes testing positive for THC that is only in their CBD salve, or so they say, how much would they need to be using?

      1. So I hit a blunt on Saturday (only two hits) and I have a urine drug test tomorrow (Tuesday) I’ve been drinking plenty of water to try and dilute my pee. Do you think I’ll be able to pass the test tomorrow considering it’s been about 3 days? And I’m not a frequent smoker.

        1. did you pass i have the same exact situation , i have .a drg test tomorrow (tues)as well and i . smoked saturday , just 2 hits …

      2. Hi doc i recently failed a drug test for marijuana the cut of was 15 and I was at 96 unfortunately I hit a blunt the day my job decided to do a random drug test I rarely smoke maybe once or twice a month if that do you think I tested so high due to the fact that I’d hit the blunt earlier that day around 8am took the test about 1 am the following day please help!!

    1. I say Fail.
      Everyone writing about their upcoming tests NEED to return to this and tell us their test reslts PLEASE!

  65. I am a medical marijuana patient and have been a chronic smoker for years smoking everyday. Recently, I was forced into a transitional housing program by my probation officer and was kept from smoking. My levels dropped down low during a 30 day period but was still positive. I was given day passes to work and before work/before going back, I was smoking and I would sneak in a vape pen 90% thc for the night. I thought since I was a MMP I could smoke since it is a state ran facility but I was wrong and was told that if I dont stop smoking I would not be allowed to work. I tested at 95 ng/ml when they finally realized my levels were rising again. Since then, I haven’t smoked any more vape pens, but I have been smoking about half a joint a day. I am starting to regret it after reading different things online. I’m scared that my levels may have not dropped. Will my levels be lower since I have been smoking WAY less? Or does that not matter? I took a test this past Sunday and I refrained from smoking 24 hours prior. Will my levels lower?

  66. I have been clean for three weeks. I smoked weed vapes that were 90 % thc about two days a week. I follow a ketogenic diet 95% percent of the week with lots of green vegtebles I am also practicing the OMAD way of eating. I also workout about 3-4 days a week.. I have passed tests from CVS but my potential new employer is sending me to a lab. I stay very hydrated and started to take creatine. I am 5ft 11 and 169 lbs. Do you think my chances are good to pass?

  67. I will periodically smoke some weed, or eat a edible. Maybe 2-3 times a month. 4 weeks ago I had an edible, and 19 days ago i smoke from a joint. I have a drug test tomorrow morning for a new job. I took a at home test and it came back negative. I have been drinking a ton of cranberry juice for the past 5 days. I am tall but overweight. What are the chance I will still have THC in my system? Do I still have enough THC in my system that it will show up on a pee test for employment?

      1. Hello Doctor. I have smoked in the past, but this year since January. I basically have smoked. I just took one or two hits from a joint on the 18th of August and i had a urine test on the 4th of September. 17 days. Again, i have not smoked this whole year, except for that day, i took a hit or two. Do you think i will turn out positive or negative? Please Doctor, what is your opinion on this?

        1. Sorry if I was not clear. In other words, if I took 1 or 2 puffs and then 17 days later I had a urine test. Will it show up?

          1. 17 days from only a few hits? it usually is gone in 3-5 days from an infrequent user like yourself. a week at most

          2. did you pass Albert? I have a similar situation. What standard did the urinalysis use? 50ng or 15ng?

  68. I will periodically smoke some weed, or eat a edible. Maybe 2-3 times a month. 4 weeks ago I had an edible, and 19 days ago i smoke from a joint. I have a drug test tomorrow morning for a new job. I took a at home test and it came back negative. I have been drinking a ton of cranberry juice for the past 5 days. I am tall but overweight. What are the chance I will still have THC in my system? Do I still have enough THC I Y system that it will show up on a pee test for employment?

  69. My question is concerning CBD with low THC. I have tried CBD oil to help with my sleeping problems, but have not seen the results that most people claim with it. I was thinking about trying CBD with low THC. I have smoked before and I slept great, so I’m thinking that the effects may be enhanced with the combination of THC. Would taking a low THC product like that likely cause me to show positive on a drug test?

  70. Hi doc!
    If I took last night 4 hits of a weed blunt and today in the morning did a random drug test ? Do you think I will pass?

    1. Hi Sir,
      I stopped smoking weed for a period of 3 years. About a year and a half ago I began smoking about a gram per day. I have not smoked since 8/27/2019. I want to add that o was smoking very good marijuana. I recently started a job where dot testing is administered and have been taking drug test for weeks now at home to see when I’m showing negative. Recently the test I take show a very very faint line. Assuming the test are correct about how much longer would you theorize for me to be completely clean. Another add on: I am short and rather plump. 5”2 and around 240 pounds. I work in a call center. I really don’t exercise much and haven’t ever been very big on drinking water. I assume massively drinking water may cause a dilute and I read exercise dan be counterproductive if I happen to get a random dot urine test. I’m super stressed about it. It’s depressing what would your thoughts be on this.

  71. Hi So I took a lab test two weeks ago and tested at 25 NG per ML, I have been using at home test for 15ng, and it still says positive, I assumed I would be clean after another two weeks, is there any reason why its taking that long or should I go to a lab to make sure that it isn’t faulty tests from the store?

    1. I smoked for a month straight. Before that nothing for years. It’s been 25 days. I swear and I intermediate fast. 6’5″ 250. I took a cup test this morning. Will I pass? I took it and I haven’t heard anything…

  72. Is the lower the NL/mg number the more accurate the test ? Like a 50nl test is more accurate than a 100nl test ? Also I’ve taken 1mg xanex once a day for a week , do you think I should be clean in 4 days? 260lbs 6’1” .

  73. I used to smoke frequently but as of the start of this year ive cut back to like once a week sometime 2 weeks I hadnt smoked for 3 weeks but then I smoked like 18 days ago what are the possibilities of testing positive on a test

  74. Hi Doc,

    Smoked 1-3 Joints daily for about 5 months. Was more like 1-2 a day in the last month. My last smoke was on Tuesday 30th July, I had an employment screening on the 12th of August. I failed and the report came back with ” Over 100 ng/ml “. I have another screening on the 16th of September and have not smoked nor do i wish to go back to doing so. I ordered some home kits with a cut off of 50 ng which are still showing as positive. I done a test yesterday, (33 days after my last smoke). Do you reckon I would be clean enough in time for the second screening? It would have been 48 days since my last smoke on the day of the test?

      1. Hi Jeffery,

        It is with a different employer for this second screening. I was open with the first employers about my reasoning’s for smoking (i thought was helping my medical problem) and provided the evidence about the medical problem. Will i need to be prepared to do the same for the second screening with or should I be okay by then? (By second screening i mean it will be my first one with that employer but is the second one within a short space of time)


          1. Hi Doc, Just following up, they ended up taking a hair sample test? What does this mean for me? I stopped smoking about 7 weeks prior but I also live with people who are Chronic smokers and have read that this can also effect this?

  75. I ingested a 10mg THC brownie. It has been 254 days since consumption of of brownie. It was consumed by accident. I recently took a urinalysis at work. I know they test urine samples to detect at the 15ng level using GS/IA testing. In short has enough time passed for it not to be detectable or below cutoff? I am not a regular user. Thanks!

      1. Doc……PLEASE HELP! I am a 43 ye old male, 5’9″ 275lbs. I smoked chronically for 6 months or better. I stopped 74 days ago and litmus tests from the dollar tree and cup tests from Walmart are still coming up dirty. I mean how fricking long can it possibly take to get clean? I have a drug test in 20 days minimum.

    1. as Dr. Fudin said, holy crap YES you’ll pass. that’s 8.5 months (ish), even extreme cases are limited out at 3 months

  76. Hi Dr. or anyone on this site that can help answer my question. So I am 5’9 260lbs. I have a drug screen coming up that i was unaware about soon. By time i take the drug test it will be 55 days since i last smoked. I was a chronic user smoking like 6-10 blunts everyday. The drug cut off level for the test i believe will be between 20ng/ml and 50ng/ml. will i be clean?

  77. Hi – My teen daughter had a urine drug test and she had a positive reading for pot – the level was 65. The nurse who gave me the news said that she thought it was high for someone who said she only smoked occasionally. I do know that she had smoked the night before, so maybe 18 hours before the drug test, I suspect the night before that too. But otherwise I have no idea how much she has smoked. I only just learned that she was smoking at all. Can you give me any context for this level? Is it high? (pardon the pun) Does it suggest more frequent use or is it hard to tell? Thanks for your thoughts, I can’t find any context for this.

  78. I thought you were nice and this website was cool and what not for one simple question. I’ve asked if I was clean took one hit if I would pass in 7 days but apparently you are acting like my dedication to this site checking back everyday and giving you my email havent got an answer being ahead of 3 people its rude doctor.

    1. JD, I don’t recall your specific question. But, sometimes it is difficult for me to determine if the question is to help a person hoodwink an employer in hopes of passing under the radar, and/or to deceive a medical provider. Either of those cases could result in harm to the employee, employer, medical provider, and/or create a public safety issue. For ethical reasons, time constraints, and other reasons, there are certain questions I simply will not answer. I hope this clarifies for you.

    2. He has other obligations than answering stupid questions like yours that have been answered numerous times already on this website. If you were truly as dedicated to this site as you say, you’d have already read the answer to your redundant question.

  79. Hello doc I smoked 3 joints 3 week prior to my medical which was last week before that I didn’t smoke for 3 months will I pass my urine test ?

  80. My confusion is what constitutes as 1 time?

    Is 1 time use equal to 1 puff or one bowl, one joint or what?

    If I were to smoke a joint of high grade marijuana, how long am I looking at, before showing clean?

    What about 3 puffs?

  81. Took personal drug test at lab. Failed it for mj. I need to take one for school next week will they find out that I failed ? They use the same lab.but different testing facility.

  82. I like how Justin and jd swish is tryin hard to get there questions answered and the doc skipped both of them for Rachael and it could have been a quick yes or no. And its not like there was a list in front of them. How rude no offense.

    1. Jayceon, questions ur referring too have been asked and answered more than 10 diff times by 10 diff people in less than week. Even I can answer their questions by reading docs replies everyone.
      J.D answer is NO if he’s provided all info and isn’t morbidly obese. drugs stay longer fat cells.

  83. Hi doctor, I am freaking out I literally haven’t smoked for about 2 years I had a night out with some friends recently smoked 1 hit on the 3rd of this month and I have a drug test coming up on the 26th I’m not a huge smoker I hardly ever smoke I’m pretty tiny I’m 24 I weigh about 98 pounds. I just want to know If I’ll pass this test

    1. Your freaking out over something you shouldent jeez! Easily youll be clean if it was truly a hit you will have no prob.

  84. Hi doc, the last ua i gave was clean after that unfortunatly i took one hit the next day. It has been a full week since and have not smoked I know it wasn’t smart and I just took one after 7 days clean. Will it come back positive?

  85. I am confused about the cut offs. If something is a 50ng/ml cut off how does this compare to a 20ng/ml cutoff. If somone passed 20ng/ml drug test will they pass a 50ng/ml drug test? What is the difference between the 20mg/ml and 50ng/ml?

    1. Rachel, If not drug is detected at 20ng/mL, it shouldnt be detected at 50ng/mL. In short, if nothing is detected at 20ng/mL, it means that the drug levels were below 20ng/mL. If the levels are LOWER than 20ng/mL, they will also be below the 50 mark.

  86. Hi Doctor, if someone has just had a clean urin sample, and haven’t smoked all but one decent hit in 7 days weighing 135 lbs. Would they pass after 7 days. Thanks for your feedback.

  87. Hello doctor, I have a test on the 26th of August at a 15ng/ml level. By the time of the test it will be 36 days since a took a small hit from a pipe and 42 days since I smoke two joints. Do you think i will be okay. I tend to workout 2-3times a week I’m 6ft 180lbs. I use to smoke a lot but it has been almost three months since I use to be a chronic user. Thank you!

      1. Hi doctor, this is a question for a friend of mine, she have a job interview in 3 days it will be on Friday and 3 days prior today (tuesday), that was last saturday she took 4 hints of a blunt she’s worried that the employer run a drug test and she will not be able to pass it. She weight 173 pounds and she’s height if 5’3. Please any advice for her will be really appreciated thank you. She’s drinking a lot of water.

      2. I’ve been clean 69 days . I have a hair follicle test & a urine test on Friday . I passed an at home test of 15ng so my urine is fine. How to you feel about my chance of passing a 90 day detection hair test?

  88. I am a nervous wreck I am new to Georgia moved here from NJ have been at pain mgmt for 16 years..I got a new doctor down here & had a drug test thru Quest I do take CBD oil & capsules from Lazarus Naturals I tested positive for marijuana metabolites 20ng/ml I am so worried that I am gonna get kicked off pain management but never failed a test before..

  89. I smoke a hit a day out of a small pipe about 4- 5 times a week . 62 year old female. . How long to test clean for a pre employment screen Workout regularly. 5’7. 155 lbs

      1. No wonder it took me 6 weeeks to come up clean. I was smoking only 3-4 hits every day for years.
        I was amazed it took so long. When I quit, I quit. Not even 1 hit. It was NOT easy on my body either.
        Thank you for your comments. They are very helpful.

  90. Hello Dr I’m 26 5’4 125lbs hit a blunt twice on July 26 I work out everyday and only drink water if I have a drug test tomorrow should I be clean? Oh and I’m not a smoker.

  91. Hello DR. I am 21 male 5’10” 138lb work out 5-6 times a week. My test for probation will be 19 days after I last smoked, I passed a 50ng/ml at home test yesterday and my test is in two days I’m not sure if they do 50 or 20ng tests at their lab. If they do 20ng/ml test is it likely that I will fail that?

      1. Dr, I am 24 and 6’2” 225 lb I have a pre employment drug test coming up for a future engineering job. I quit smoking on April 15th 2019 and before I smoked for 3 years every day with the last year using concentrates and/or normal flower. I stopped cold turkey and sweat multiple times a week weather it’s working out or playing baseball. Do you think I should be worrying still or should I be fine. It’s been about 110 days.

          1. Hello Doctor! I was a chronic user but I have been clean since June 7. I am female, five foot five inches tall and weigh around 153 pounds. I am currently 66 days clean today and have taken an at home 50ng test and can see a faint line but it’s a line. I’m going to have to take a 20ng test in about a week to week in half. Do I have a chance of passing the 20ng?

  92. I took a few puffs off of a blunt last night and took one hit off a vape with THC concentrate, and I may or may not be required to take a urinalysis test on the 23rd. I had been a regular user for a few years, but a little over a year ago I cut it down to only occasionally (1-2 times a week at most), and haven’t smoked at all in the past month except for last night. I’ve been drinking plenty of water and walking/running as much as I can throughout the day and plan to keep doing so over the next couple of days then rest on the day before the possible test. It seems to me like I’m probably on the borderline, what are your thoughts?

  93. if I smoked 3 puffs of a one hitter June 29th and tomorrow I am getting drug tested will it be positive?

      1. Sorry to bother just needed some reassurance
        I haven’t smoked in years but about a week ago I started hitting a pipe 3-4 times a day and have a drug test in 15 days
        I have only smoked for the last 6 days or so but if I stop it all now and drink water will I be okay for a standard 50/ngl test?

    1. Dr. Fudin. I have been a chronic smoker for the past 10 years or so. I’m 26 and weigh about 195 lbs standing 5 ft 9 in. BMI in the mid to high 20s. I was smoking 3-5 blunts a day of low-grade with regular thc oil pen usage (10-20 hits per day for the past year.) I’ve been putting off my DOT drug test for quite some time. I am now officially 65 days clean and have been staying hydrated. I have passed 3 50 ng/ml at-home tests recently but am unsure if I will pass a 15 ng/ml. My original plan was to wait a full 3 months however the sooner I can get to work the better. My gut tells me I’m clean enough but the fear of failure is stopping me from proceeding with the test. What do you think my chances are? Thank you for your insight.

      1. Rob,

        If I were you, I’d ask your doctor to order a urine test by chromatography. That is even more accurate than the test is question. If that’s negative the 15ng/mL will be negative, and if it’s not, it is a false positive. If all is negative, you should be fine.

        1. Smoke everyday for 10 years atleast 5 joints a day if not more took me 120 to get clean at. 220lbs and 6.2 tall .. and for all u dot smokers the Federal cut off is 50ng for fmcsa

  94. How does one know (or best estimate) the amount of thc the subject is consuming? The manno study (sitation 8) utilized “joints” of less than 1 gram with a potency of less than 4% taken in 8 “puffs”.

    1. Does different strains make a difference of the level of thc and how long it stays in your system

  95. DR Fudin
    fathers day June 17th someone passed me a vape with concentrate THC in it .I thought it was tobacco held it for a second then coughed it out really quick it was too late it was high concentrate I was testing positive 8 days later on a 20 ng/mg stick .PM’s clinics cut offs can go down to 10 or 5 ng/ ml even traces smh . Dr will I be ok I am 150 pounds 5’2 27 BMI .I have a great dr I don’t want to lose it was not intentional even told the person who had it earlier I don’t I cant smoke .I have to drop on 10th of July will I be ok I have been drinking alot of water ….. doing a toxin rid cranberry juice no use prior to that 27 days was all I had total …..10th is coming up …..
    Please Answer Back I have bad panic attacks !!!!!!

    1. Niki, If it was one hit, one time only on 6/17, by 7/10 you likely will be fine. But, it is curious why you would think that the vape contained tobacco rather than THC or something else – that story will be a harder sell to you doctor than explaining why you were positive after the fact.

      1. bar like who would vape weed in a bar I had smoked a few ciggs tht night I don’t even smoke tobacco .I had a couple beers which is fine in moderation with dr im lucky to have a cool dr like I do I would never be stupid like that with only 25 days I know how low cut off only 5 ng/ml for a pm test would leave traces where other labs just say negative …. the guy switched out in bar my bf’s tobacco oil I thought he just didn’t want to go out and have another cigg it was so late . I said let me hit that not smelling the difference that’s when I pulled it in my lungs choked and tasted what I just did and said loudly this is you know what eyes got big and thought OMG NO ….. he laughed at me like I was going to be ok………. I was pissed didn’t do another one trust me on that…. I have been a very good patient for a very long time don’t want to let my dr down like that who has trusted me and been so awesome with me this long…… I get offered weed ll the time and turn it down ……… definitely would never do it on purpose especially with only 25 days left ..

  96. Hey Dr. I’m a 19 y/o kid who weighs 140 lbs. And I recently went to beach week 2 weeks ago (Beach week is where graduated seniors from high school go down to the beach for the week and drink and smoke) and smoked 3 times I was there. I probably smoked 3 hits from someone’s joint then 2 from someone’s dab pen then the next night I took 2 hits of my friends bong. Prior to smoking that 2-3 times I was clean for 4 months. How long do you think it’ll stay in my system for? I’m not a big smoker at all my metabolism rate is average.

  97. I smoked 3 times from the bong 5 days ago..
    I have smoked in nearly 2 months prior to that
    Will I pass my urine test tomorrow?

  98. I’m 5’3 and 105lbs, I have my medical marijuana card but obviously that doesn’t matter when it comes to needing a job and finding out they drug test. I don’t have a lot of body fat and it’s only because I smoke marijuana that I have finally reached 105lbs (due to severe nausea- why I qualified for my card) I’m trying to get to 120lbs but I also have a fast metabolism. Anyway, I haven’t smoked in 2 weeks and just got the call I have to test in the morning. I’m freaking out. Do you think a miracle could happen and I could possibly pass? I’m also worried because my urine is usually clear probably because I only drink water. I never drink any alcohol, pop, juice or anything. Just water. I hear they can fail you for that but my Dr told me that it was a good thing to have clear urine on a regular it means I’m healthy. I’m so confused.

    1. Kristy, The clarity of your urine is not a problem as long as your electrolytes are normal, which presumably they are. My guess is that it will probably test positive.

  99. Good day Dr. Fudin or anyone else willing to offer an informed opinion,

    I was offered a DOT regulated job on the condition I pass a screening. Split sample, 5-panel cutoff of 50ng/mL, possible confirmation by GC-MS cutoff of 15ng/mL.

    However 2 weeks ago I actually failed another unrelated 5-panel at 35ng/mL. It had been at least 3-months closer to 4 since I had ingested any THC. Full disclosure, the night before I had drank pretty hard on gin and tonics, I’m trying to keep this in check..personal belief that this is not an acceptable replacement for pot. So I was considerably dehydrated and had strong coffee prior to the test as well. I barely provided enough urine to meet the level.

    One week later after learning of the concentrated 35ng/mL result I took a rapid screen which passed the, I assume 50ng/mL cutoff. More hydrated this time.
    Prior to yesterday, in the 2 weeks since the 35ng/mL result, I’ve since exercised moderately, hydrated well, drank an ‘Herbal Clean Ultra-Eliminex’ two days prior, some sauna time, decent nutrition.

    At 16 days since the 35ng/mL, and 9 days after having passed a rapid 5-panel, yesterday morning I took the DOT pre-employment UA. Morning of, two hours prior I ate a pretty hearty breakfast, consumed considerable amounts of water, a strong espresso/cold brew, urinated a few times, then gave my sample. Even made an attempt to give only ‘mid-stream’ urine while still providing enough for the DOT split sample. The color, while pretty light wasn’t really clear.

    After 2 weeks and given the efforts I made, I went into the test pretty confident but now, for what’s riding on this, and the nature this situation while awaiting a result, I’m worrying and 2nd guessing.

    My concern is that if a possible dilute, it is summer, I’ve always been instructed to consume ample water. If creatine levels test low that it could possibly flag above the 15ng/mL cutoff on GC/MS confirmation as Dilute-Positive.

    I’m decent shape, 32 y.o., 6′ 192lbs, roughly 15-20% BMI. I’ve always been a heavy sweater, not sure if that’s indicative of a good metabolism/toxin elimination.

    Essentially I’m praying 2 weeks and a few efforts was enough to reduce a concentrated 35ng/mL sample, to a diluted <15ng/mL sample.

    Thank you for reading/offering opinions,


    1. I have been smoking for past 6 months..2 puffs in the morning and 3 puffs at night…
      stopped for 6 days then smoked for a week….then stopped for 5 days… and smoked one more time…
      since that last day i have not smoked for 10 days now…I have been drinking lots of water and tested negative in at home tests.
      Will i pass the lab test?

  100. Hi there! I have a DOT test on the 28th. I took a hit from a bowl two weeks ago, once on Friday and once on Saturday. Before that I took a few dabs about 5 weeks ago. I’ve taken 2 at home tests and both show negative (with a very faint line). I’ve even ordered a 3 day detox kit to start soon. What are my chances of passing? And will the detox kit help??

    1. Clinical lab tech here, I run these tests on a daily basis. At home kits and the ones used in hospitals and clinical labs are exactly the same in most cases, with the cutoff at 50ng/mL. Speaking from experience, using the competetive binding Immunoassay cards generally used in hospitals and at home tests, labs are required to call a negative result on an analyte whenever ANY line is seen in the test region, no matter how faint. So chances are, if the at home test was negative, the lab’s test will show negative as well. Also, according to the data above, the dabs should have been out of your system within 30-40 days, and the one bowl hit would have been below detectable levels after 3-4 days. I’d say you’re golden

      1. Hi chad I have a question about lab testing. I’m prescribed Adderall and I had to give a urine sample to receive my medication. Well I haven’t smoked any Marijuana in 49 days. I bought many at home drug tests to test for marijuana at 50ng/ml I did pass 15 days after I last smoked. After reading all these comments I started to worry/panic I won’t pass my urine test at the hospital to continue to get my meds. I maybe would smoke a pinch size puff a couple times a week off and on for about 2-3 months. I don’t plan on going back to smoking marijuana and I bought 4 of the 20ng/ml tests and passed all of those too. I didn’t tell my doctor that I had smoked 49 days ago and I just took my urine test on 11/1/19. Do you think I will pass? How long does it take to get the results back? Will I get a 2nd chance to continue getting my med?

  101. Hey Doc,

    May 11-14th I smoked approximately 2-2 1/2 blunts. Before this I hadn’t smoked in two years. On May 20th I was selected for a random drug test (immunoassay). I drank some certo and 3 water bottles about 45 minutes before testing. Will I test positive?

  102. I had a half a 10mg gummy for the 1st time in 3 months 10 days ago. I have a urine test tomorrow …thoughts?

  103. I’m 5’8 175lbs and smoked quite frequently for the past couple of months I would say close to once a day. I am drinking a lot of water and exercise every day I have a body fat percent of 9% and I’ve never struggled with gaining weight so I assumed my metabolism is quite fast. I have a drug test in about 4 and a half weeks do you think I’ll be okay?

  104. Hello, I recently stopped smoking exactly 40 days to this day, I’ve taking many home drug tests at the 20ng and 2 days ago I still tested positive, I’m getting 50 ng tests in the mail today or tomorrow, I was just an occasional smoker mostly once a day at night time, is it just the sensitive tests that show a positive result, i’m 5’7″ 200lbs!? thanks…

      1. Hey I had to take a CDL dot random drug test… I used mostly synthetic urine, but it wasn’t enough to get to the line so I used a squeeze of my own dirty urine. Is there any possibility I will come up negative on the drug test l.

  105. I smoked pod (two puffs) for the first time ever on April 12 this year and haven’t smoked again since then. They took a urine sample today. Could i test positive somehow? I am 27, 5,6 tall and 143 pounds.

      1. Curious for myself. I don’t smoke at all and I decided to take 2 puffs of my friends joint 5 days ago. Is there anything I can do to decrease THC in my system in the next few days? I just learned I will be taking a drug urinalysis in the near future. What are the odds that I will test positive?

  106. I work in residential real estate maintenance. Most days i am exposed to strong concentrations of second hand smoke from residents in my buildings. I actually felt a little woozy last week and had a Urine test on Friday. I dont smoke myself but I’m afraid i may fail from the second hand smoke. Is this possible?

  107. Dr. I tested weekly for over a year when I was chronically smoking marijuana (dry flower) 4-5 blunts daily (.7g-1g each). Why is it that my THC levels seemed to never exceed slightly over 200 ng/ml? It wouldn’t matter if I smoked 1 blunt or 10. Sometimes smoking one or two blunts the same day as the test. Smoking all day before. My levels would “cap out” around 200? I have now stopped smoking and am sober. Just curious if you have any feedback.

      1. I smoked for 4 weeks straight, was never a chronic user prior. cutoff was 50ng DOT reg. for test.
        Smoked the day before a test and came up “negative”. I’m baffled. Failed a home test the night before test. Comments? Dr. Fudin Much appreciated.

        this was also listed in my report

        “collector did not complete specimen bottles(s) released to box”.
        “specimen validity testing was performed within federal guidelines “

  108. My 14 year old son just tested at 1022 ng/ml THC. Is this considered to be very high (no pun intended)? The lab told us he needed to get immediate help.

    1. It is pretty high. certainly a therapeutic level that can get you into trouble. And I agree, he needs help!

  109. How will I fair?

    On Sat April 27, 2019, I had a few drinks ( happy drunk) and a couple hits from someone’s blunt/joint. Prior to this for the month of April, I have had a drink edible of 10 mg THC every Wednesday. I work out 4-6 times every week and I sweat it + sit in the sauna for 20 minutes minimum every time I hit the gym. I worked out between April 27 and May 1 and consumed high calorific foods. I am 165 lbs, 5’9 & with a slight belly fat/ core muscle. My UA was fairly concentrated with coconut water, B vitamins, steak soup + I have remained well hydrated and flushed out a lot in the interim days. I consumed a high protein high fiber diet combined with multi-vitamins, fat burners (occasionally but not on the day of my UA). I got UA tested @ 50 ng/l on May 1 that includes ETG testing for a court order. What will be my possible result?

      1. Hi

        I was wondering I haven’t smoked in months, I toll 3 hits in January of this year, about 4 hits at the beginning of April and 1hit on 4/20. I had my drug test today and I had only about 4 ounces of water to drink before the test. Will I test positive?

    1. This country, and the world, really needs to get its priorities straight. I’m still trying to wrap my head around why smoking a plant is illegal, and why people are incarcerated because of it.

      Am I the only one that finds all of this to be the biggest waste of time. Ohhhhh… ahhhhhh you smoked a plant, you’re going to jail, you’re getting fired.

      Preached by the same people sucking down bottles of Wine, Scotch, and Prozac

      What a crock of horseshit.

      1. you got that right brother hate to be dealing with this crap. and its funny how the least harmful drug stays in system the longest. keep on toking. one.

  110. How long do you think it would be detected for a 15ng/ml cut off level. I smoked 3 times in a 33 day span. Before that i hadnt smoked. For 7 months. Im also skinny, been working out. Staying hydrated, eating great & detoxing

  111. I smoked THC vape “dabs” high concentration THC about 40 days ago was the last time. I am 6’4″ skinny and fast metabolism 180lbs or less. Took a drug test today with a 20ng/ml cut off for THC. Drank water all day and took vitamins for urine color regularly urinated every half hour or so before test. I think I am in the clear?? What do you think?

  112. I am a female, 5’10, 160 lbs.

    My blood screening had the following results:(Copied exactly)
    0.060% alcohol
    2.3 ng/ml Tetrahydrocannabinol (THC)
    11.7 ng/ml Carboxy THC
    This was indicated as a “high level of THC” even though I did not feel impaired and was able to conduct work using a high degree of concentration and fine motor skills. Any perspective?

    Thank you in advance.

  113. Hello Dr. Fumin

    I am a 6’1 235 lb 21 year old male who used to smoke mid to upper grade marijuana every day for about a year up until mid February of this year. I have a little less than 2 weeks until my urine test. I have calculated 84 days in total from the day I stopped to the day of the test. I just recently tested myself and came out positive with over 100 ng in my system. I have about 12 days left until my test, do you think I can pass?

  114. Hey Doc! I wanted to discuss edibles! Would one, 10 mg THC serving (fruit snack) be considered a “single use”? What would that 10mg serving equate to in ng/ml inside the body? Experimenting by using at home tests in the past I tested positive at 50 ng/ml cutoff (shocker haha) ~12 hours after consuming one 10mg gummy; took another at home test ~90 hours after use and heavy hydration, results were negative. Always a bit weary of at home tests so I wanted to get some science behind it! Not a frequent user in the slightest, 5’8″ 180lbs, in the 17-20% BF range, exercise on average 4 days a week. Thanks!!

  115. I tested 326 ng/nl and I am curious if that’s high? My doctor was alright with it, I live in Oregon and all, but just wondering.

      1. I am about 400lbs I smoke daily but only about 2 or 3 times a day and usually only 5 to 6 hits out of my bong I have a saliva test coming up on the 29 do you think I can pass if I don’t smoke any more till then

  116. Took two puffs of weed for the first time in a year . Not a smoker of weed a year ago either just make bad choices when I’ve had too much to drink. Anyways it’s been three weeks but I took a pre employment urine test today . I should be okay correct ?

  117. Normally smoke 3 fairly strong puffs of flower a night. Stopped 7 days ago, home test (the stricter one, the 15 rather than the 50, gave me one clean test and then a positive on the next day. I’m currently fasting and running most days in ketosis in order to burn fat cells. Will do a carb load day before the test to make sure I’m running on glycogen during piss test and also do a Niacin load day before and day of. Will over hydrate and then supplement with a b vitamin complex to avoid a rejection due to dilation.

    Alll that considered, should I piss clean on a standard issue 50 pre employment screen about 16 days after last toke? thanks for the advice

  118. Amazing read.

    Doc: I am a regular user. Stopped smoking weed between April 1-10 then smoked daily until April 15. Pre employment test with cut off of 50ng/ml in 3 weeks. I plan to eat healthy and exercise daily. I am male. Average build. What are chances I will pass?

    Thank you

  119. I smoke a whole blunt 60+ days ago with about 2 grams in it I have a hair follicle test in 3 days am I okay?

      1. Doc I need help! I smoked on Sunday night at 11pm approx 2 small hits from a gravity bong. I had an unexpected urine drug test on Thursday approx 1pm. I took a home test on Tuesday and passed. Problem is I take Adderall but small dose 5mg every once in a while . I took that on Tuesday and Wednesday. I think I will pass the prelim for thc but I am concerned I will fail the prelim for amphetamines at 500ng/ml and sample will be further tested at 15ng/ml level for thc and fail that ! They will test even though I’m prescribed Adderall. Please tell me if you think I will pass! I have a fast metabolism, I Took a test right before the real test Thursday and passed for amphetamines at 1000ng/ml test and thc 50ng/ml. Prior to this no thc in a long time. Also drank lots of water and peed twice before real test. Please I need your advice !

  120. I only normally only smoke when my pipeline work is done for the winter for only maybe up to a week. Then i do not smoke until the end of the next job season. But for some dumb reason this year i smoked on march 28 1 hit of strong weed. The next day I got a slight head change off of some not strong pot. Very very slight change.. Then i took 3 mild hits of brick weed it was a pretty significant high but not like that 1 hit from strong weed.almost a week later i smoked 2 hits of not so strong again. That last 2 hits was no later than April 5. On april 10th iland on april 11 I took 2 at home urine tests and passed them. On april 12 I took a preemployment test, I drank about 3/4 of a gallon of water before the test. I urinated 3 times before the test. The test urine was probably the first pee where the water was really really flowing through me. Becauae it was pretty clear (just a little very slight touch if color) and it was a super long pee. I should feel confident that i passed but the amount of responsibility that rests upon me (my family) has me terribly nervous. Im very disappointed in myself even though ive passed with less time and more regular smoking when i was younger. But having children that rely on me has me crazy scared. Even though i should pass i will never again put the my livelyhood at risk. So anyways 1 hit of chronic. Next day a slight head change and nect day 3 hits of regular weed head change then a week later 2 small hits of regular weed. 7days later a urine test at work. This after passing two home tests… Im good right?

  121. Will my boyfriend pass a follicle test if he sits in a garage with me with a fan on and door cracked open while I smoke my medical marijuana regularly everyday? I would like to be free to be able to smoke in the house but they are afraid the second hand smoke will make him fail his drug test for a job he’s trying to get.
    So some places says it’s a myth to fail hair follicle test from second hand marijuana smoke but other sites won’t confirm if he will pass or not from the second hand smoke.
    Will he pass from if he around me while I am smoking?

  122. Does hydration level affect likeliness of a positive test? I did not dilute, and was dehydrated during my test (only consumed 30 oz of water total that morning). If a person is dehydrated (dark urine) how does that affect immunoassay sensitivity?

  123. So I have a test coming up in the next week or so. I abstained from smoking from mid December to the end of February. In March I had 2 fairly high dose edibles and 1 normal joint as well as a joint wrapped in wax covered in kief. I smoked that last one over the course of a week. The next day I get a call for an interview I was not expecting and have since been “hired” and will be getting my test done soon. The total time between my last ingestion of THC to when my test is will range anywhere from 18-21 days. Based on the frequency up to that point would it seem likely that I would pass a 20ng/ml test? I don’t know for sure if that’s what the test will be at, but it feels like a good guess.

  124. I do not use marijuana very often. I took one hit February 26th, then on March 24th I ate a 10mg candy. I just happened to get called in for a random drug test at work the very next day. Apparently the initial test with a 50ng/ml cutoff showed up positive for marijuana metabolites and amphetamines because I take adderall. The confirmation test showed that my level of amphetamine was 8029 ng/ml, to be expected. My thc metabolite level was 15ng/ml according to the confirmation test, right at the cutoff. I was then fired for the positive test. How is it that I showed positive on the immunoassay test with a 50ng/ml cutoff when my level of metabolites was so much lower? The doctor told me its because the tests work differently, but it doesnt make sense to me because they are measuring the same thing in the same units and the confirmation test is supposed to be more accurate.

      1. I have a pre employment drug test coming up. Now, I have a few questions. I had been using a dab pen (pure thc extract) several times a day for about a month or two. I am 5’8 and weigh 170 pounds, with about 10-12% body fat at most. I haven’t taken a single puff of of it since February 26th, and it is April 9th. My drug test is in about 2-3 weeks, I have kept a steady workout regimen and have drank a gallon of water a day every day (not to mention two strong detox drinks and a lot of cranberry juice) since even before I stopped. Am I likely to pass?
        One more question, I also use a juul (nicotine vaporizer) that my friend who is a heavy chronic smoker also used a few times. Would I test positive just for making contact with his saliva, even if he wiped it off? Thank you, I appreciate the answers as I am worried about my test.

      2. If I pass a 50nl home test will I pass a15ng home test I am not by any means a frequent user and haven’t used in 12 days and all I did 12 days ago was take 2 hits of a oil pen

  125. Hello, I’m just curious, I have not ingested or smoked or taken any type of drug for over 4 months. I was thinking about smoking a few hits of weed tonight, I would have 14 days before I might get tested at an interview. I weigh 150lbs, male, 5’8”, 10% body fat at most. Would I test positive for “thc-cooh” after the 13 days and be clean on the 14th? Asking before I make a rash decision. I appreciate your time and thank you for your help.

        1. It depends on how much you ingest and also how accurate that claim is, since quality control generally is not great with these products. The short answer is that you probably wouldn’t test positive, but there is a remote chance you can.

  126. Curious for thoughts behind my usage versus activity levels:

    Heavy user for one year of primarily lower concentration <30% with mixed breaks every month for a week; however, I am really interested in its comparison to my fitness/ activity levels.

    Consistent movement/ activity ranging from mountaineering/skiing/alpine climbing/trail-running/etc. for 6+ years now with no compelling/ noticeable hindrance by my smoking habits. As far as gauging fitness, I have ascended 9000' in around 7miles (Paradise to Mt. Rainier Summit) in 12 hours carrying ~ 20lbs.; capable of ascending 4000' over 4 miles in 80minutes w/ <10lbs.

    Unsure if these measurements help at all but it is how I gauge fitness levels – cheers

  127. When judging by single use or moderate use, im sure it’s based on amount smoked compared to a single day, but if I smoked 4 hits total out of a vape pen the entire night, does that fall under moderate use or single use?

    It’s a concentrate so I’m thinking moderate, but does it jump even higher to a heavier level of smoking?

    I just scrolled through an impressive amount of questions asked. Thank you guys for taking the time to explain things to us!

  128. I use CBD drops every day Morning and Night. I use Lazarus Naturals and they state it may have .03 % of THC. I am curious if i will test positive on a drug test that does have a limit if 50 ng/ml.
    I know people that want to use it also, but they know they get random drug test and and are un-sure if they should use it.
    Also if it it used as a Balm or Massage oil, does it enter the blood the same as the drops would?

    Thank you,

      1. Doc if I smoke a roach witch is like 3 to 4 puffs will I test dirty in my next drug test ? Or how long will it take to clear my system I used to smoke very heavily but I been clean for almost 4 weeks an I need a head change any chance of me passing my drug test ?

      1. Took 2 hits Saturday night. Never smoked before that. Have a drug test tomorrow. I’m 5’10 230lbs. Home test was negative. What are the chances of me passing this drug test?

      2. Good evening Doctor,
        if I ingested two edible gummies of 4.5 mg each on March 29th and another single edible gummy of 4.5 mg on March 30th, (a total of 13.5 mg), will my urine drug test scheduled on April 11th or April 12th (I have the options for either day) come out negative? I want to clarify that it had been a month that I was waiting for a callback for a certain job, hence I believed I had not been accepted for the job. They randomly called me four days ago to offer me the job and schedule my drug test. I am an active individual and have been eating extremely clean and exercising daily. Do you think I have a good chance if I am drinking a lot of water as detoxing to pass the test? I don’t think I ingested over the 50ng/mL limit on the test.. but I would like to know if you think I will pass the test.

  129. Hey Doc, so I was a chronic user for the past few years, I had to quit for tasc services via probation. My initial test said 112ng in my urine, the next was 107 ng, the next was 100ng. The 3rd test was taken after 13 days. I’m waiting on my next test to come in. Currently 24 days clean. I’m 23, 6”1, 230. Is there any reason why my levels arnt significantly dropping?

    1. If used chronically, cannabinoids can sequester in body tissue and take many weeks to come down. There is a way to determine for new versus old use by testing carboxy THC to creatinine ratio

      1. Hey Doc so I received my my results for my 20th day of being clean. Currently 29 days clean but that test showed a major spike in my levels. It went from 100 to 170. Which makes zero sense because I’m not even around it anymore. I have started working out everyday and drinking only water. Also on phentermine 37.5 to help lose weight. I have read where losing weight can increase these. But my po will just see an increase and assume I’m smoking again. Is there any reason for this increase and if so what can prove I’m not smoking.

      2. Hey Doc, just called back to asked my thc creative levels and they went from 87 to 137. I was told this is a good thing because it clearly shows I’m not using which leans in my favor. But just wanted to verify with you.

  130. Hello, I had a pre acceptance test for a non profit culinary training program today and the dip strip came back positive for thc. When I went back to the organization they accused me of lying when I stated I haven’t smoked since September 2018. They intimated that if I admitted smoking it would be ok.. I don’t feel comfortable lying and going with their assumptions because of my pride at being sober off many drugs. They sent me to different clinic for a ln actual lab test… I am over 300 lbs and have been around some ppl that we’re smoking and was wondering if that’s what affected the dip strip test and what this new test will show? Thank u

    1. Ask them to send the sample of definitive testing by chromatography. There are several drugs that can cause false positive THC, including over-the-counter drugs. No, being around people that smoked marijuana would not cause you to test positive.

  131. I was offered a job last month that required a drug test. I had 13 days to take the test. Up to that point I was smoking the thc oil…usually 2-3 hits on weekdays, and 6 hits on the weekends. I was using the the easy@home drug tests to see if I was clean. My first test failed, the 2nd had a faint line. The next 7 after that I passed with 2 lines. I even tested my morning urine the day after the test and passed. I found out that I was going to have to take the test again because my urine was too diluted due to the fact I had to “fast” for labs 12 hours prior…moving forward I was given an extra 21 days (34 in all) I kept testing myself and passing. I went to the gym at least 8 times and did the stair master for 30 minutes, elliptical for 15 minutes and the bike for 15 minutes as well. I drink a lot of water so that wasn’t an issue for me either. Do you think I passed?

  132. I’ve been using a CBD oil for about 7 months. Just took a random and failed. How is that possible with such a minimum amount of THC in this oil.. Actually didn’t take any 24 hours prior to test. Also don’t understand the levels..Company said that my level numbers were 2..2.

      1. Is it a different type of test I can request? This oil is all I use and my test results show a level of 22.

  133. Can anyone please advise me….

    If a urine test returns 4.4ug/L for THC, is that a trace or high level of THC?

    If high, would it be enough to cause someone to hallucinate?

      1. Dr. Fudin. I took 4-5 hits of a joint 6 days ago and took a drug test today. I am 250 pounds and 5 ft 10. Will I pass my drug test? Before that I hadn’t smoked in 4 months. They are sending the drug test to the lab

  134. Hello! So i’m so confused with the article because I don’t get the grams & etc . But anyways, I hit a dab pen for my first time in Jan 22nd 2019 or 24th . I hit it like 2 times I think and honestly I didn’t know what was in the dab pen until they told me it was THC. I got a job yesterday (March 22nd) and I took a drug test. Will it be positive? Just recently I had food poisoning so my stomach is really clean and I been using the restroom and most of the time I was dehydrated . Will I still pass even though it was my first time?

    1. I briefly inhaled some second-hand pot smoke. I immediately left the room. 35 hours later took a DOT drug test at an airline. I should pass since I’m a non-user correct?

  135. I took a urine test this morning. I have smoked 2 times in three weeks. One hit each time. I last smoked Sunday night. The time before that was probably 2 weeks. Today is Thursday and I took a random, I drank enough water that my urine was clear with just a slight tint of yellow. I’m 5’9 195. I’m average size. Do you think my chance are good? Thank you

    1. I smoked At most for times a week for a good amount, have been clean for three weeks do you think I will pass a quest diagnostic test for a job internship. It’s a piss test

  136. Hi Dr. Fudin,

    I hope you are doing well! I have a pre-employment drug screen coming up in 2 days. I used to smoke once a week at least only, max twice on/off weeks. I stopped completely on January 15th and have used none ever since. It’s been 60+ days, I weigh 115 pounds and am 5”2. Some tests at home have been giving me negative results but at times positive. What is the likelihood I will be passing my drug screen?

    Thank you!

      1. Hi! I have never been a smoker before but the last two months I have taken one or 2 hits 3-5 times a week. I just quit 3 days ago and I have a job coming up that will drug test me. I’m trying to push it off for two weeks. I am 5’7 120lbs and 18/20% body fat. How long before I can get a negative result?

      2. Hi I’ve been clean for a month now. I took maybe 4 hits on the 15th of March. About how long will it take to pass a 20ng weed test?

      3. I don’t think that’s completely true, I think it affects people differently,,,to be honest I perform better when I use to smoke and I paid attention more also

    1. Hi I’ve been clean for a month now. I took maybe 4 hits on the 15th of March. About how long will it take to pass a 20ng weed test?

  137. I used to be a frequent user. I smoked 1 hit off of a dab pen on Sunday afternoon (3/17). How long before this will be out of my system. I am 24 years old and 200 lbs. Not very active. I may be randomly tested for work at any time and do not want to lose my job.

  138. The marijuana used in the study from 2001 contained only 3.58% THC. Nobody smokes marijuana with that little THC content. Many of the strains that medical and recreational users have access to in the real world have 20% Or even 25% THC.

    If you were to recalculate the total intake of THC in a joint (based on the 753mg marijuana per joint in the study) with a strain containing 20% THC, the joint would have approx 150mg of THC.

    Returning to your patient – 2 hits from a joint could easily be 1/3 of the entire joint. This means that she realistically smoked about 50mg of THC – twice what is indicated in the study and it is highly likely that this would cause a positive test result.

  139. My thc levels were 900 when I first got tested. They want to see my levels go down and u have not smoked in a week. Will that lower my levels? And if so can I smoke today and still not raise the levels above 900?

  140. hello,great site,59, 220 lbs,.fit active male,two toaks three times a night at 3, 6 and 8 pm daily,for 35 yrs never smoke during day back yard homegrown.i hurt myself at work at 7:30 in morning.went for urine test and tested positive at 181 ng/mll this put me over the 15 ng/mll. I feel that i was not impaired . my question is.Was the urine test the proper accurate test for impairment.. I do not feel impaired in the mornings. i work as a heavy duty mechanic and welder,. Do you feel that i would be impaired to do my duties. i have a great record for not getting hurt or making mistakes at my job. I would appreciate your view on this situation. I have quit smoking for the last week and don t need to smoke but i enjoyed it over they need me to go see a substance abuse proffesional and rehab program, which i feel unessesary .but to have my job back they have hoops to jump long to clear my system. Thanks for your site and opinion Tom from canada awaitinng a reply

  141. hello,great site,59, 220 lbs,.fit active male,two toaks three times a night at 3, 6 and 8 pm daily,for 35 yrs never smoke during day back yard homegrown.i hurt myself at work at 7:30 in morning.went for urine test and tested positive at 181 ng/mll this put me over the 15 ng/mll. I feel that i was not impaired . my question is.Was the urine test the proper accurate test for impairment.. I do not feel impaired in the mornings. i work as a heavy duty mechanic and welder,. Do you feel that i would be impaired to do my duties. i have a great record for not getting hurt or making mistakes at my job. I would appreciate your view on this situation. I have quit smoking for the last week and don t need to smoke but i enjoyed it over they need me to go see a substance abuse profesional and rehab program, which i feel unnessesary.but to have my job back they have hoops to jump long to clear my system. Thanks for your site and opinion Tom from canada

  142. Hello Dr. Jeffrey Fudin,

    I am a daily smoker and slightly overweight. I will be taking a urine test 10-14 days from when I stopped smoking. I assume that is cutting it too close for comfort. If I were to moderately dilute my urine by consuming water, is it likely to beat the test without raising red flags?

    Secondary question, what measurements are used to determine if a test is invalid based on dilution?

  143. Hey,
    I took one hit on weed joint on Saturday morning at about 9:30am and had a urine test on 11:30am on the Monday morning after consuming a lot of water the preceding day. I urinated first thing in the morning and consumed water up to the urine test. I am 6ft 5 and weigh 209lbs. I rarely ever smoke.

    Your thoughts please.

    Many Thanks.

  144. Hello Dr,

    I smoked on Friday 3/8, a puff or two on 3/10 and ate a gummy bear and 1/3 of a joint on 3/12. I’m a 30yo male at 191lbs and 22% BF – is it likely to test positive or negative? It’s a pre-employment test.
    Thank you

      1. How did your test go? I have a test on 4/12. I smoke 3-4 hits before bed at night, everynight. Just wondering what my odds are. Hope your test went well.

  145. Hi
    I’ve been smoking for 12 years and quit December 29th 2018 it is now 3/13/19 and im testing positive for 10ng/ml with one week spiking to 16 ng/ml how is it possible to spike with no new use and can I prove no new use with a hair follicle? How can i show that I havent been using? These uas are being sent to a lab with no cut off only showing counts. They also show my creatinine levels. It’s like the people reading the print outs dont understand that that low of count compaired to my creatinine levels mean that in NOT using. What can I do to prove it?

  146. I commented a little while ago about stopping on 1/18/19 & testing positive 2/22/19 but I forgot to add that I’m 5’7 & 135 lbs if that helps to specify your answer to my inquiry, Thank you!!

  147. I was a chronic user up until 1/18/19, I am now being tested regularly. On 2/22/19 I tested positive & the lab result came back at what the lab personnel said was a “9” today on 3/12/19 I tested positive again. The lab rep said with a level 9 almost 3 weeks ago I should not be testing positive anymore. I have not smoked since 1/18/19. Is there any explaination as to why I could still be testing positive? Could it just be because I was a chronic user? Can you explain what the levels mean, a 9 for instance. Please & Thank you!

  148. I feel like I should be ok but I have always read that THC is fat soluble so I’m not sure if my weight will affect my chances.

  149. Hi I am 25, 270 pounds and I smoked out of an oil pen for 3 days with my sister on February 17th. I have a drug test in the next 2 days, prior to smoking with my sister the last time I smoked was July of 2018. I was a daily smoker for most my life but because of my job I quit entirely, smoking only that time since. What do you think my odds are of passing? Im in a legal state but applying for a Federal job so state law doesn’t matter to my employer.

  150. Hello Dr. Jeffrey Fudin, I’m Justus Wilmoth. I smoked 3 or 4 hits of marijuana on the 6th and 7th and tooks 4 more hits on the 9th and have a urine test on the 14th. I try to drink alot of water and I play basketball so im very active. In 14 years old and I weigh 127 lbs and am 5’2. Will I pass?

    1. Justus, With that usage at your age, I’m afraid there’s a lot of things you will not pass moving forward. If you’re able to, I suggest you stop smoking altogether or get professional help to stop smoking.

      1. Marijuana is not addicting. Stop making it seem like it is. Everyone gets curious to try it.

        1. It can be addictive. Pretty much anything that causes pleasure can, food, sex, gambling. I love weed but let’s be logical and realistic and change the opinions we have when new information is presented.

  151. Hi Dr. Ludin,

    I have been a regular, daily Marijuana user for the past couple of years. I stopped consuming on 1/22/19 and it is 3/12/19 today. I am 100 lbs, 5’1.5, and have been drinking plenty of water since I stopped. I have also been eating better and go to the sauna mostly every day. I have taken a couple of at home-drug tests and have tested negative lately, except for a different at home test, which I tested positive on this morning. I will take the pre-employment drug test on either 3/14 or 3/16. In your opinion, will I pass a urine test?


  152. Hi Dr. Fudin,

    I have been a regular, daily user of Marijuana for the past couple of years. I stopped consuming on 1/22/19 and it is 3/12/19 today. I will be taking a pre-employment drug test in 2-4 days. I weight about 100 lbs and am 5’1.5. I have been drinking plenty of water since I have stopped. I have taken at home-drug tests and tested negative for some, but a different at home test came out positive this morning. What are the chances of testing negative on the real test?


      1. Dr. Jeff,

        I started smoking thc oil and had 9 days without from December 30th until January 9th. From the 9th of January I smoked just about everyday until I found out about a job that had a pre-employment drug test around February 12th. My date was set for 13 days later…the first home test FAILED, two days later I saw a faint clear 2nd line. The next 7 home tests I passed. I actually drank too much water the day of the test and was told (damn near 3 weeks later) I had to take it again LOL. So now we have 33 days later…will I be good?

        How was I smoking?
        Almost everyday up until Feb 12, 3 puffs max on weekdays, 6 puffs max on weekends

        At least 7 days I did:
        30 Minutes Stair master
        15 minutes elliptical
        15 minutes bike
        I walk about 1.5 miles when I go and come from the gym

        Water: I AM A BEAST when it comes to water.

        Last thing, I have even been testing my morning Urine and I am passing home tests….WILL I PASS!!!

          1. If Marijuana affects performance, why is alcohol and any other products, any different?

          2. Oh…I did not think this question posted…I actually typed it again. BUT YOU DON’T HAVE TO TELL ME TWICE…..I’m giving my THC pen away and I’m DONE!!!

          3. *************UPDATE
            So the 2nd drug test was lost. I had to retake my 3rd today at 50 days clean….How Do You Like Them Odds????

  153. Hi, I smoked a little bit on the 6th and 7th and smoked 4 puffs on the 9th and I have a test on the 14th I’m trying to drink alot. I play alot of basketball so I’m active I’m 127 lbs 5’2 and 14 yo. Will I pass?

  154. Hello Doc,

    Question I recently went to a dab bar here in Wa State and tried a 4 different small dabs of 85% thc wax. I haven’t used any Thc before this for 2 months or longer. I know I will have a drug test in about 6 weeks for my doctor so I am going to stop. The test detection is 20 ng/ml and carboxyl thc at 2ng/ml … I’m 160lbs low BMI and just a one time user. Curious what you think my test results will be if I give it about 6 weeks to clear out. Thanks again!

  155. I tested positive at 40nl/ml on a 50nl -15nl test. How long will it take for me to clean out my system? Best guess?

  156. Hi Dr.,
    I have smoked 3 times in my life. Once about 5 months ago, the second time about 4 weeks ago, and most recently last night. I took two hits off of a pax vaporizer. I just found out I have to take a drug test within the next two weeks. I’m going to try to put it off for as long as I can, but how long do you think it will be before I should be able to pass, it is an employment test so it should be 50ng? I run every day and drink a lot of water. Yesterday I ran 16 miles before smoking. I typically run about 4 miles a day. Should I try to exercise as much as I can? I ordered some home drug tests off amazon and they will be here in two days, so I will try to start tracking it. Any advice helps. Thanks!

  157. Hello, Dr. Thank you so much for this service!

    I took 3 hits of marijuana Thursday at 10pm and I have a UA for probation tomorrow, Tuesday, around 5p. I’m relatively active and eat healthy, 6’0, 185, 37yo. Think I’ll pass, or fail? Thank you!

      1. Hey doc, way to crush a 14-year-old’s spirit somewhere in another comment. Your omments are often a bit demeaning, out of touch with research on the health benefits of cannabinoids from around the world, and indicative of a lack of knowledge about the very long history of the medicinal use of marijuana. I wonder, how much does Purdue (or whomever) pay you to go to their pain treatment conferences and prescribe their legal versions of heroin?

        1. Purdue doesn’t pay me a dime. Oxycodone is not legal heroin, in fact oxycodone is closer in chemical structure to over the counter dextromethorphan – by your comparison then, Robitussin is legal heroin – don’t fall for the PROPAganda you hear. Irrespective of what you believe, there is por evidence for THC as an analgesic with the exception of certain specific neuropathies. If you believe otherwise, respond with some placebo controlled studies that have been peer reviewed and published in a professional journal – then you’ll have my attention. And for the record, there is clear evidence that chronic use THC in young teens affects brain development.

          1. Dr Fudin your reply to the 14 yo was spot on, this is coming from a mother of 4 children.
            Marijuana is an Addictive drug!!! Reading these questions to you, it is obvious Marijuana is an addictive drug. When you are plotting on a calendar when you have to do a urinalysis and when your able to do your last hit in order not to test positive, your addicted.
            Marijuana used to not be addictive back when i was in Highschool in the 80s but its a whole new plant its no joke!!

        2. You are a fool, if marijuana wasnt a problem no one would be on this thread. If its not addiciting why put your job and very livlihood in jeapordy for your silly unaddicting buzz? 14 years old and getting stoned sounds pretty stupid to me and im no doctor.

  158. Last night, I took about 5 hits of weed. Prior to that, the last time I smoked was about a year ago, so I’ve smoked twice my whole life. I have a drug test in about 20 days. Do you think I will pass? I’m 116 lbs if that helps.

  159. Just tested positive at 200ng. I am 6;2″ 165 lbs. I smoke 90% THC daily, if I stop today, how long before I test clean?

      1. Hi, I took like 3-4 big hits of medical marijuana on Saturday at 4 pm and have a test this Thursday will I test clean? I’m 14 yo and 127 lbs. Thanks!

  160. Hello, really loved the article so much great information. I have to take a drug test tomorrow. I’m female 5’3 probably 20% body fat. I took 1 hit 3 days ago. Other than that I smoke once a week or once every other week. What are the chances I’ll pass my drug test?

  161. I last smoked 1 gram over the course of 4 days starting on February 15th, prior to that I hadn’t smoked in two months. I was a heavy user for almost a year. I have a pre employment drug screening on March 11th. I took a home drug test and it was negative. I’m about 113 pounds, I don’t work out often but I’ve been trying to work out and drink plenty of water. What’s the likelihood I will pass my drug screening?

  162. Hello doctor, so I was a somewhat frequent smoker for 4 weeks, train twice a day my entire liife intensively, have a crazy metabolism, low body fat percentage. I stopped for around a week In a half . Then took a hit or two then stopped for 6 days then took a test in which the cutoff test was 150ng/ml. Keep in mind I was sweating and drinking lots of fluid the days leading up (and exercising twice a day with intense cardio) and the period where I was a frequent user for 4 weeks it was maybe a few hits a night or a small joint maximum.

  163. Hey Dr
    I haven’t smoke since 1/21/19 and it 3/2/21 I’m a heavy smoker the pass year about 2-4 grams a day. im worried about passing the cut off level for uriuary test. 15ng/ml

    1. I relatively close to same boat as above. My details: 5’7″ 142 lbs male 28 y/o Didn’t smoke till Jan 4, 2019 and was clean for around 45 days prior. I smoked around 1 g of mids or so a night till Feb 12, 2019. I have abstained from smoking since. I will be running for the next 2 or so weeks to assist in boosting my metabolism. I was hoping i can be be clean 3/19. Do you believe that is possible?
      I am unsure which to rate myself.
      Daily use 10-15 days
      Chronic heavy use >30 days

  164. I accidentally took 2-3 puffs off a friends vape on 2/22/19. Thought it was just nicotine but then learned it was weed oil, that’s all I was told. I have since been overcome with anxiety since I am waiting to hear back about a job. I do not smoke at all. I did try it a few times but it was like 6-7 years ago and didn’t like how it made me feel. Anyway. Over the last two days I have done multiple at home tests which have been negative and even went to a lab today 2/28/19 and peed in a drug test cup and it also came out negative. Lady at the lab said she didn’t think I had anything to worry about but everything I’ve read about this drug is it stays in the system(fat) a long time.

    Are all all drug test cut offs 50 ngml for thc or can they be 20? Because that is what I’m worried about honestly. The job is part of the Federal Aviation Administration

    1. Employment tests are generally 50ng/mL. You probably have nothing to worry about with minimal one time use a week ago.

      1. I just took a UA Pre Employment drug screen today, 1/1/2019 . I used to eat about half a brownie, nightly for sleep on and off for about 2 months. My last time consuming a brownie was roughly 35 days ago. I purchased an at home THC testing kit which indicated both times I tested myself which was 2/27 & 2/28 that it was negative with a faint red line. I’m female, age 43 in decent to good health. 5’0 ft and about 119 lbs. Im not exactly sure what my BMI is but I am not super lean nor am I overweight, maybe by 5-7 lbs and I do not work out but do eat mostly healthy with plenty of vegetables and low carbs. I drink a cup to a cup and half of coffee every day and a cup of either green tea, peppermint or other types of herble tea usually 3-5 times a week.About a liter of water a day sometimes with lemons and genarally remember to take my multi vit daily.
        I’m curious to know if my at home negative results with be that of the same from the lab results. I only recently started consuming the half brownie in October 2018 on and off ( some nights I had nothing a few nights in a row, also some weeks) I would say I ate a half a brownie on a regular for about a month to month and a half before stopping completely 35 days ago from today.

      2. Hello doctor ,
        I was a heavy smoker for 3 years (4-5 times a week ). I stopped 13 days ago and when i tried the home kit i tested positive . I m 5 11 , 210 pounds . How long it will take me to test negative . I have a pre-employment drug screening coming in 2-3 weeks . Thank you

          1. hey j.w about blood test … how long would it take to get down bellow 2.5 ng/ml of blood , been a chronic smoker for years j.w i here 12 hrs some times 2 days . if i pass a home.swab that macs out at 20 ng/ml of saliva should i be fine

  165. I smoked multiple times daily for 3 months. I would say it averaged out to around a quarter of an ounce a week. I abstained for 3 weeks, smoked a half over the course of 2 weeks, and have since been clean for 30 days. I know your not some type of magical guru who can predict the future but based on this information what would you say my chances are of passing a 50ml drug test? I play college baseball, I am 5’9 170 pounds with a stockier build (although i have lost 20 pounds over the last 3 months.) Thank you!

  166. I’m a very chronic smoker for 3+ years .. I’m 6’3 170pound male.. I’m active I play college basketball. If I stop smoking today and take niacin and do a lot of sweating do you think I would be clean by the 17th of March?

  167. Is this only for inhaled products or does the results also include tinctures & topicals? I’m on pain management and since the ‘opioid crisis’ my pill intake was basically cut in half. As a result my PM said i could try alternative medicine. I found a wonderful tincture called high cbd tincture made by green halo. It’s a full spectrum product made with a cannabis plant that rates at around 7%thc 7%cbd. I’ve been taking .5ml twice a day and it’s helped me tremendously in addition to my pain pills. I also found some topical products by the same company with the same 7%thc/7%cbd to help instant pain relief. But now my PM is saying i need to be under a 50 rather then the 100 I’m at. First off i have no idea what that means but after reading a few articles I’m assuming it’s 50ng/ml which sounds like you basically can’t have any thc in your system. Is that correct? Or is there a way i can continue taking this tincture while coming under that 50ng/ml? And if i have to stop taking the tincture could i still use the topicals with the thc/cbd and be safely under the 50ng/ml? And on that note what is the highest thc level of tinctures & topical could i use?

    Thanks for taking the time to read this convoluted message lol.

      1. So I smoked on February 9th, took two puffs of a blunt. Now I got a random UA today on the 25th. I’m 165lbs and 6’1… I drink a lot of tea and fluids, and have taken cranberry(azo) gummies on and off last week. What do you think my odds are of passing? It’s a government UA with a 50ng/ml cutoff. I’m pretty active and am required to go on runs (3-4 miles) and on the 22nd I did a 12 mile march.

  168. Dr. I tested a negative on a 50ng/ml test. After I took that test I smoked hashish at night for the past 2 days. (Maybe .15g in all) how many days after cessation do you think it will take for me to be able to pass a 15ng/ml ua?

  169. I am a light user (4-5 times a week) and haven’t smoked in 10 days and I have an upcoming work pee test next week. I did a home test yesterday and it came up negative. I went one step further the same day and went to a “Doc in the Box” and paid $50 for a 5-panel test, which came back negative. When I take my employment test next week, I am concerned there may be a lingering platelet or two that releases that day and causes a positive result. So the question is… based on my negative home test, and the negative “Doc in the Box” test, am I THC free/undetectable?

      1. Thanks Doc. It’s not for a security clearance, I’m assuming (and I’m no Doc) – that’s it’s going to be the same DOT 5-panel that I paid $50 for at the clinic. In your opinion, what type urinalysis do most US employers use? Immunoassay or chromatography? My thanks again….

  170. Hi, I am 18 years old and I weigh 48 kgs. Last time I smoked was on the 18th of January and I smoked like 2 cones, I have not smoked since then. I have to do a urine drug test for a job some time this week or next week, will the tests come back positive or negative?

    1. That’s literally me right now. I never smoked until Sunday and I have a drug test Friday. I workout everyday and drink a lot of water so I am wondering how long it will stay in my system. I weigh 130lbs

  171. The past month I have smoked about 5 times, each time about 3 hits. Last time I smoked was 5 days ago. I am an in shape 5’5 145lb male. I took a First Check THC test that tests for 50 ng/ml and tested negative. I have a drug test in 3 days. Is there a chance I can test positive or negative?

  172. I need an answer quick I smoked Saturday and Sunday last week but no a whole joint a couple of hits here and there both days haven’t smoked since and have a drug test next week will I past or fail

  173. I passed a pee test about 3 weeks ago, haven’t smoked any weed since, until last night(2-3puffs) would I be able to pee clean below 50 ng/mg in a couple days… is that even enough to register? tIA

  174. Hi ive been a chronic smoke for years now and smoke 4 joints a day. I stopped for 3 months in 2015 and started back smoking 4 joints a day. Im 5″10 250 pounds How long will it take for me to become clean. Just stopped today. Doing a career change.

      1. Hey Jeffrey, I’m super nervous. So I don’t smoke weed at all until Friday night about 8-9 pm i was super drunk and took a puff not a deep puff just a quick puff of a friends blunt. I pee’d all night from the alcohol. Woke up about 8 am to find out that I had a UA at 5 pm that day. And I couldn’t prepare for it. However I did drink 2 bottles of water when i woke up and pee’d twice beforehand leaving my house.. Is there any chance that I could’ve passed that UA? I weigh 105 pounds and I’m 5’2..

  175. Hi Jeffrey Fudin,

    This is a long shot but i’ll have a go. I haven’t inhaled for months but 11 days ago I took 1 puff of marijuana. Today I had a drug test for work and I am very worried that it will come up positive. I have low BF percentage and active. I tried 2 of those dollar store tests and they came out negative (apparently they test for 50ng/ml).

    Am I screwed?

  176. Hello,
    I live in New Jersey. I have been a regular daily user of marijuana for several years. Within that time period, I have stopped for weeks at a time, but then returned. About 3 months ago, I moved from pipe to vape and have been taking about 10 to 20 vape hits per day at 380 degrees. I was recently offered a teacher job, and I was surprised that they required a drug test. I stopped vaping/smoking at that time which was on 1/11/19. I took a FirstCheck test on 1/25/19, so was clean from 1/11/19-1/25/19 and I tested positive with 32 ng/ml. I am concerned about how long it will take to test negative. Today is 1/30/19 and I am going to self test again on 2/1/19, and plan to self-test every Friday until negative. Here is my question, does that result of 32 ng/ml show how much thc is in my bloodstream? And, if it is low enough, under a certain threshhold at the time of my actual test, do you think they will say that ok it is low enough so let’s give him the job, or it has to be completely negative for them to say its ok? Any experience with being approved for teacher jobs? By the way, I am 6’4″. 205 lbs in great shape and thin and work out daily. I am tempted just to go in there and tell them, “hey, I smoke occasionally, and it helps me with relaxation, but I would never do it on the job.” Because they do seem very cool, but I don’t want to “blow it”! Thank you for your advice. Jackson Browne

    1. Jackson, Here are the answers to your questions…

      Does that result of 32 ng/ml show how much thc is in my bloodstream? No

      And, if it is low enough, under a certain threshold at the time of my actual test, do you think they will say that ok it is low enough so let’s give him the job. No, they will not know the difference and they won’t care; to them, positive is positive

      Any experience with being approved for teacher jobs? Yes. Generally any positive is a problem. They do not want the liability if a parent sues for ANY reason, or there is some sort of mishap that can be blamed on “drug use”. Also, they will look at this a a poor influence on students who are being taught not to use drugs from a healthy lifestyle perspective.

  177. I smoke 1-2 hits a day for 2 weeks from a pipe, I am 5’10” and 215 lbs., and before this I didn’t smoke for 8 months none at all. I walk around a lot for work average about 2.5 miles, it was 17 days since I last smoked and 2 days after my urinalysis I had did an at home drug test passed the 50ng/ml 2 times, and there was a line starting on the 15ng/ml line utilizing the uTest at hom test. I am worried I may have failed the urinalysis at the 15 ng/ml gc/ms cutoff level, but passed the 50 ng/ml initial cutoff immunoassay test. I have heard of people failing at 38 ng/ml before which is below 50 ng/ml and got fired. I’m really worried. I failed please give me an insight as I am very paranoid.

  178. I have smoked marijuana every single day for 25 years. At least 4 grams a day. I have a looong list of health issues and refuse to take the narcotic cocktails most Drs like to prescribe as they leave me in a border line catatonic state when taken together and when taken individually do not work. I smoke like this daily. I still work as a mgr in one of the top100 companies in the world. I raised 3 kids. I have a healthy marriage and I drive regularly. When I do not smoke I can barely function due to the massive amounts of pain, muscle spasms, Charlie horses, numbness, burning etc that i get wide spread that’s darn near debilitating. Smoking marijuana is not bad. It doesn’t make you stupid like it shows in movies or on that 70s show lol. It makes it where people with severe agonizing pain can function on a level that doesnt leave them at the mercy of care givers. It could be really great to see more education on the benefits of THC. CBD oil doesnt work for me, edibles do not work for me just smoking it. Why do you think that is?

    1. Mona, There are a number of reasons for this. Smoking gives a quicker peak and that may be important for your response. Also, the percentage of THC and strain will be important. The data for pain alone is poor, which the exception of neuropathies and certain types of GI pain related to gastric seizures. But, even real chronic pain comes with anxiety and other issues that could respond to cannabinoids. Generally pain make anxiety worse and anxiety makes pain worse, so that interplay could also help to explain why you in particular are responding.

          1. Thanks for your reply. Just so I’m clear , a person that never smoked marijuana, took a single puff, and that single puff would be detected in a hair test up to 4 months later?

          2. Thank you again for the reply. I will update after my test on Feb 4th. I haven’t smoked for many years. Unfortunately I took 1 puff just after Thanksgiving and didn’t know I’d be subjected to hair test. But I do have a test on feb 4th. Hopefully I’ll pass and wont make the mistake again

  179. So, on Saturday(yesterday) I took about 2 puffs maximum of weed for the very first time in my life(was not proud of myself). One puff from a bong and one puff from a vaporizer. I also found out that I have a drug test that I will have to take by Thursday. Am I going to pass? By your explanation I should be well under 50 nans, so I should be fine, right? Weed is something I will never do again.

    1. unlucky looks like you chose to smoke it, you should be worried your gonna fail it. im only saying this cause you are disrespecting weed, you underestimate it

    2. In the exact same position as you. My medical test is this Thursday too and I smoked last Thursday. Let me know if it went good for you? Good luck

  180. I think the numbers are too low. I know most chronic smokers, even very thin ones would have trouble passing after 30days… I am below average weight and extremely active and it took me 2,5 months to pass
    I would say 45- 60 days at least in most cases for cronic users

  181. Dr Fundin. So if I hadn’t smoked in several years and smoked 2 hits off vaporizer pen at low power what are the odds I would test positive at a 50 mg/no cutoff after 24 days? I’m 6’1 and 190lbs and fairly active a normal body fat percentage. Thank you

  182. In need of help…..
    My wife and I are in a family legal battle where marijuana use is becoming a factor, we live in illinois, she was approved for her medical card, however she was told to do some research on “legal levels of intoxication” per state, and mostly I have found that 5 mcg seems to be the standard, for operating a vehicle, she doesnt drive, I’m having a difficult time finding what I need, any help would be greatly appreciated.

  183. I’ve smoked about 5 times a week for 7 years. In the last 3 months, I’ve smoked a few puffs from a shared joint or small hit from a pipe 3-4 times per month. I have 24 days before a drug test. Do I have a realistic chance of passing if I do not smoke at all during this 24 day time period?

    1. No, you were a chronic user and the need yes you slowed slowed down. However, your body has been full of thc for 7 years. If you had quit cold turkey it could have taken you anywhere from 30 days to 90-ish days to be clean. Depending on your metabolism and body fat and so on. I have heard many stories and witnessed chronic users being clean in as little as two weeks, or as long as 3 months. Everyone is different, run and pound water, good luck buddy.

  184. My friend had not smoked in nearly 6 months, he took 1 or two puffs off of a joint and worked out several days after. He’s a big guy but in very good shape. 13 days from the time he took those puffs he had a screening at 15 ng/ml. Is it possible he passed?

  185. I’ve been smoking a lot for the past month prior to that no. I have a drug test in a few days. I’m looking to detox water eyc. Do I have a chance

    1. Nope you’re going to fail. Your mother will be very dissapointed in you, but relax you didnt want that crappy job anyways!

  186. I am in the process of writing an advisory/advocacy letter to my states department of corrections to help them rewrite their policy concerning positive UA results for thc that are a result of consuming hemp based cbd products that contain >.3% thc. Currently our state has medical cannabis laws but those on supervision are not allowed to participate because of the schedule 1 classification of thc. A standard condition of supervision being that a parollee must remain compliant to both state and federal laws.
    With the passage of the 2019 farm bill, one section made changes to the controlled substance act
    completely removing hemp based thc from being a scheduled substance.
    Because of this change at the federal level it is recommended that the states policy be updated to allow those on supervision to consume full spectrum hemp products.
    In order to accommodate this change while making sure that those on supervision are not abusing cannabis it would be helpful to know what sort of thc levels could be expected to show up due to the prolonged authorized use of hemp based cbd products containing >.3% thc.
    Feel free to contact me by email. Thank you for your time.

    1. Hello, I’m looking into using full spectrum CBD oil for daily usage. However, I’m worried about the 0.3% showing up in UA. If you have any info on the THC levels from prolonged use I would greatly appreciate it. I’m employed federally and cannot risk a positive screening, but would like to explore this route for my health conditions.

  187. Micro-dosing or ingesting a small amount <1.0g from a clean state is very hard to detect in urine—unless it is concentrated. Even smoking tough for a few days with +5 or more days to clean out is hard to detect—unless your urine is concentrated. If you build up a reserve of metabolites from moderate to chronic use, then you could be in danger of failing the “lifestyle” test. Drink lots of fluids and exercise your body multiple times a week. Produce more urine more often and youll have less buildup in your kidneys/bladder to exhaust for the test of one deposit of urine. Most elimination rates that have been published rarely surpass over 10/ng per mililiter—per/hr for a rare or one time user. So… dont be a dipshit, dont be impaired at work ever, and moderate consumption and remain active physically, and drink fluids with electrolytes, sugars, vitamins.

  188. Dr. Fudin,

    Thank you for your article and for your time.

    I am in a very confusing situation, that I would like assistance further understanding so that I can more accurately discuss with the individuals I need to.

    In effort to find a non-addictive, non-narcotic consumable that addressed anxiety and joint pain for my mother, I decided to purchase and try two different CBD oils from two different companies. Throughout November I ingested one full dropper (approximately 1.5 mL) of a CBD isolate concentrate daily; this was ineffective for both my mother and I. Thus, I purchased a Full Spectrum CBD Oil (with maximum THC content of 0.3% as allowed by the FDA). I ingested one full dropper (1.5 mL) daily for 10 days; the effects were more noticeable however were not worth the financial cost. Thus, my mother and I both stopped ingesting.

    On 12/4 I willingly went to a medical screening, which included a full-panel drug screen, in an effort to complete necessary requirements for research I am completing at a medical facility. On 12/7 I received an unsettling call from the testing agency. The personnel stated that my urine test came back positive for marijuana, at a level of 24 ng/mL. They tested the urine sample a second time to confirm, with the same results. I was then asked if I am a marijuana user (I am not) or if I have a medical marijuana card (I do not). The personnel told me that it is within my right to have my sample tested a third time at a facility of my choice. To do so, I would need to contact the employer (or in this case the place I am completing research at) to request my urine be tested somewhere else.

    I then contacted both of the CBD oil companies. The isolate was stated to have 0% THC, thus it would be literally impossible for me to have THC in my system from their product. The second company stated that their Full Spectrum CBD Oil did contain THC, at a level of <0.3%. They were very helpful, in stating that sometimes the use of CBD oil can cause a false-positive on marijuana screens, especially when the test is not specific to the THC canabanoid. The founder also stated that he would be willing to have further conversations with the institution I am completing my research at and the school I am studying at, as a failed drug test has potentially severe consequences.

    I am extremely concerned on how and why I tested positive for THC! I have not ingested anything other than these two CBD oil concentrates, and that has only been for 1,000 mL a day) can cause false-positives, along with consuming poppy-seeds, other hemp products, or ibuprofen. I do use a variety of hemp products (both topicals and protein powders, etc.) but it still seems so surprising that I would fail a drug test given the circumstances.

    Your insight into what may have caused a false-positive drug test, given my circumstances, would ease my mind and help me as I have a conversation with the head of research on Monday. I am more than willing to take further tests. I have taken other urine tests in the past 2.5 years for other clinical requirements, and always had negative results. This is very concerning for me.

    Also, any guidance on how to further translate the test results of 24 ng/mL of THC into a quantity of something I consumed, would be helpful.

    Please let me know if you have any questions.


    1. Chelsea, A level of 24ng/mL is quite small. Irrespective of what the companies told you, the amount of THC in their CBD does not have tight quality controls and are not required by law. My presumption is that there was more THC in there than expected. That low of a concentration is indicative of minor use. There are other ways for them to track use and to prove you are not using new doses. They can order a THC and a THC ratio which splits out old and new use.

      1. Dr. Fudin,

        Thank you for your time and quick response.

        Do you think that it is possible that although the company states that they test each CBD oil tincture before they send it out, that they don’t? How would I confirm if they do or not other than by their word and documentation? I do have a little bit of the CBD oil left. Can I independently have it tested?

        The facility that completed the drug screen is not familiar with a THC and a THS ration test. Is it called something else? I will be ordering a third test to be done on the same sample from a facility of my choice. Any aid in requesting the appropriate test and/or the appropriate testing facility would be appreciated. If you know of somewhere in Atlanta I can have the sample sent to, would appreciate the resource.


          1. Do you know of a testing facility I can send the leftover CBD oil concentrate I have, to be tested for THC quantity?


      2. Hey Fubin,
        How long til I pass a drug test if I eat a edible cookie for the first time and haven’t smoked in months?

          1. I have not smoked for over a week, I am a little overweight and when I do smoke I only take two to three hits I never smoke a whole blunt or joint to myself. Will I be okay to drug fest tomorrow ?

        1. My friend has been an heavy everyday dab smoker..he quit exactly 40 days ago and took his test today. Having a cutoff at 50ng and confirmatiory of 15 ng…does he have an chance of passing?

  189. Well.. did some experimenting myself on this topic. I had a single smoking dose of marijuana (roughly 5-6 hits) and approx. 72 after I took a urine test from a local drug store and tested negative for marijuana. The minimum cut off was 50 ng/ml. I sent the results to the lab to get my exact levels. Not sure if they will provide that info but if they do I will update. I am around 6ft, 200 pounds very moderate exercise. Was a moderate user prior but was clean for roughly a month prior to this (job related). Just wanted to thank the researchers on this article because it is very well put together and detailed. Hope this helps other out there.

    1. I am not a heavy or morderate weed smoker. I haven’t smoked weed in maybe 10-11 months. I recently took 5-6 small hits of weed from glass pipe on the 29th of November. I took a drug text for a job on the December 6 in the afternoon around 2 after smashing a a regular bottle of water. i’m in shape. i often run and play basketball sweat at night and eat healthy fruit and fish for the most part. will i pass the test?

  190. Hmmmm I am wondering if this information is really accurate. I honest to god smoked a half of joint of some not so good pot 11 days ago. I took a drug test 3 days ago and tested positive on a home drug test. I am not a moderate smoker. I am a one time smoker and it was still in my system after 8 days.

      1. Dr, I haven’t smoked or consumed in edible form since the 29th of January. I wouldn’t call myself a heavy smoker maybe a few times a week a couple puffs. I am 4 11 and 120. UA on the 26th of February. Will I pass???

  191. There’s a lot of questions unanswered here that can vary depending on your weight and whether you detox your body days before a drug test. I think if you’re a heavy set person that doesn’t exercise or burn any fat then you are more likely to test positive compared to an average size person who eats healthy / detoxes the body and are both moderate users taking an urine test 5 days after consuming THC

  192. I don’t know if Mr. Fudin (or anybody else) is still monitoring this thread but in doing some research, this is the closest I’ve come to any answers to some questions I have.

    I used to be an extremely heavy, chronic smoker for about 15 years. I was never ashamed of it and was always honest with all health care providers regarding my usage. Nobody seemed at all interested. The the opioid epidemic hit. I live in a state where we have the highest overdose death rate in the nation. If anything, doctors were even more accepting of my smoking. They seemed happy that I wasn’t using opiates. Last year, I cut down to a few times a week. Then, in August, 2018, I quit completely (for religious reasons). When I went to my new psychiatrist (old one retired) on 10/23/18, I told him all of this. He said that his practice drug tests every patient and that they have to pass at least 3 tests (for everything) or he will not see them anymore. He said it was required by law (I checked and it isn’t true). I am prescribed an anti-convulsant as a mood stabilizers for Bipolar. He ordered a urine drug test and I went immediately to the lab after leaving his office. He is affiliated with a hospital and the lab is in the hospital. I didn’t think anything of it. Knowing that THC can take a while to clear, I seriously thought it would be okay after 75 days of no use. Nobody has ever given me a hard time over my use. And even if I failed, I have 2 more chances.

    I was shocked when the nurse called the next morning and said that not only was I positive for marijuana, that it was “high”. I asked for a specific number but she just said that it “wasn’t important”. I retired after 20+ years in the legal field so that raised some alarm bells for me. I went to the medical records department and got a copy of my results. In fact, it was a “presumptive positive” for marijuana with no reflex testing and a negative for the anti-convulsant I take for the Bipolar (last dose the morning of my appointment)!!

    I called back and spoke with a nursing supervisor to demand confirmation testing. Not only was I a little upset that this hadn’t been ordered to begin with, I was disturbed that the doctor wasn’t at all worried about the anti-convulsant negative. The nurse said that they never order confirmation testing because it’s too expensive and their lab isn’t set up for it. She said she would talk to the doctor and get back to me but that it was highly unusual for any further testing to be done. At this point, I was concerned about lab error. I called my GP and asked for a written lab order which included reflex testing that I could take to an independent lab. Later, the GP’s nurse called back and said that the doctor didn’t feel that would be appropriate and that I should talk to the psych again to discuss it. My GP is also based out of the same hospital. I got the impression that she didn’t want to step on the psych’s toes by ordering any further testing.

    Today, the psych nurse called and said the doctor was sending an electronic order for a blood test. I went immediately to the lab to have it drawn. Again, the orders were sent electronically so I didn’t know what was ordered until I was in the chair. At that time, the tech told me it was just a marijuana test but that it was being sent to an outside lab and would take 5-7 days to come back. Apparently, still no concern about the negative anti-convulsant result.

    I have researched several medical sources and have found very little specifically related to marijuana blood testing. Everything seems to be about urine screens. In the legal field, we always asked for blood testing with GC/MS. According to case law, it is the gold standard. I guess I’m looking at it from that point of view – we don’t convict people or send them to jail based on a “presumptive positive” so how can doctors make treatment decisions based on that? Then, in the course of my research, I read several articles regarding the uptick in prosecutions for Medicare fraud related to outrageous amounts for claims related to urine drug screens, often when doctors had a financial interest in the lab. Thinking back, my old psychiatrist ordered maybe 2 tests a year (with reflex testing) but they were sent to an independent outside lab. He had no financial interest in them and never had any issue with my marijuana use as long as the anti-convulsant levels stayed steady and I remained stable.

    What are your thoughts on this matter? Specifically, the ethics of basing treatment decisions on a “presumptive positive”? And sending every single patient for a drug screen – including those with no history of substance abuse disorders? Also, is a blood test really better when it comes to detecting drugs such as marijuana? From what I gather, a urine screen can tell you how much they are using but a blood screen is more specific about when they might have used and the level of impairment from it. I admit, I do not like the idea of being made to feel as if I am under suspicion for something. Trust is a two way street. If I am supposed to trust my doctor and follow his recommendations, I expect the same treatment in return.

  193. I haven’t smoke pot in about 10 months. I took one bong hit about 10 days ago I had a drug test today. Pass or fail? Please respond