Jan 052013
 January 5, 2013

marijuana weed drug testing system saliva hair urineThe data used to create this infographic is gathered from research on drug testing methods and the information presented by drug screen manufacturers. Some resources include Redwood ToxicologyCannabis Drug Testing,California NORML. The information presented is only a guide or estimate since drug testing has many variables that can influence a positive or negative outcome.

How Long Does Marijuana Stay in your System? is the most frequently asked question that we receive at HomeHealthTesting.com. While there is no definitive answer, we have presented some guidelines. The only way to really know if you are positive is to test yourself. You can test yourself with a cheap drug test and know if you are positive. Buy a THC urine drug test

How long does THC stay in your system?

The most common drug tests used are urine, saliva and hair. Each test has a different detection time which is important to know. The urine drug test is the most commonly used because it is cheap and has a longer detection time than a saliva test. There are several very important factors that can influence how long THC will be present in your urine:

  • Weight
  • Body Fat
  • Amount Used
  • Frequency of Use

Since these factors will vary greatly for each individual, there are no definitive guidelines to tell you how long you can test positive for THC.

On a Urine Drug Test, THC will appear as a positive within 2-5 hours of use. How long it will still show on a urine drug test is estimated based on frequency of use, but does not take into account the weight and body fat of the marijuana user:

  • One Time User may show positive for 1-6 days
  • Moderate User may show positive for 7-13 days
  • Frequent User may show positive for 15 or more days
  • Heavy User may show positive for 30 or more days
  • Some Heavy Pot Smokers have reported being positive 45-90 days after quitting

On a Saliva Drug Test, THC will test positive within one hour of use, but may only show positive for about 12 hours after last use.

On a Hair Drug Test, THC will show up about 7 days after use and most hair drug tests will test for a 90 day period. However, THC does not always bind to the hair follicle which makes it not always considered an accurate testing method for marijuana use.

The most reliable way to know if you are testing positive for marijuana use is to drug test yourself.

how long does weed stay in your system
By: HomeHealthTesting.com

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About Johnny Green

Johnny Green is a marijuana activist from Oregon. He has a Bachelor's Degree in Public Policy. Follow Johnny Green on Facebook and Twitter. Also, feel free to email any concerns.
  • Nick

    I haven’t smoked in a little over 2 weeks before I stopped I smoked almost every night and if I smoke a gram tonight how long do you think it will take to get out of my system I’m 145 lbs and 5’9” and I drink a decent amount of water everyday and work out 3 times a week.

  • GanjasBestfriend

    Deleted this for security purposes. Hooah!

    • Connor

      1 Large Blunt a month should stay in your system < two weeks after use or less depending on your body's metabolism. I would recommend recording the average time between tests for the next 5 tests, then make your decision with that data. I am a Medical Cannabis Patient for 3 years and I have grown the plant for almost a decade.

  • skunkhead

    hey there,I’m a recovering heroin/crack addict,i live in London and now work in the field supporting others. I have smoked cannabis most of my life,about 25-30 years. More to the point, i have been smoking strong super skunks for about 10 years without a break, smoking roughly 1.5 to 2 grams per day, until now! I stopped a couple of weeks ago, 1. because i feel like a hypocrite and 2. I have recently changed jobs, the new organisation i now work for are talking about drug testing! Can you advise me on the length of time THC will remain in my system and where i can purchase a drug testing kit for myself! Any advice from a legal point of view would be helpful, for example, must they have a drug testing policy in place before they can test me,do they need good reason to test me and can they single me out for testing? I have read articles that say heavy long term use can be in your system for up to 90 days!

  • Jimmy

    well, i may be in a pickle right now. i was peer pressured into smoking weed (haven’t smoked in about 7 months) and smoked about 2 days ago (7/17). I took a couple of hits. i’m 17, 6’1 and weigh 150 pounds. how long do you guys think it’ll be until i’ll be clean?

    • Yo

      Wait a few days, drink water, or dhiarretics like coffee, tea etc. if you think it’ll still be in your system there’s detox drinks at GNC and also if u want to test yourself u can do that too

  • pls help

    does cranberry juice & coffee actually help remove THC from your system

  • Adriana Guerrero

    I’ve smoked 4 times this month and next month I have a random drug test. When I smoke, I only take 4 hits out of a blunt and that’s it. I wouldn’t smoke back to back. I would do it every other day or week. I want to know if I stop, will I be good for the drug test next month?

  • Daltinoh

    I havent smoked since around may 25th then I smoked one small blunt Saturday im 160lbs 6 foot and drink a good amount of water. If i increase my water intake can i flush it out quicker. It should be out in a couple days correct?

  • Honeeey

    I smoked once around June 20th and again July 16th but it wasn’t planned. I am having a drug test at MEPS JULY 23rd , will the drugs still be in my system ? Do I need to push back the date ?

    • Court

      Red Bull big can

      • Van

        How does red bull help?

  • Ladyy

    Soooo question. Idk what classifies me as a “moderate” or “light” smoker but all I know is I take about 4-6 hits from a BOWL a day. I am 17 years old, 5’4″, and 107 lbs. I have a court date August 5th. If today is the last day I smoke, will I be clean by the court date? I’m sorry if this comes off as a dumb question (because I see lots of you smoke 4-6 blunts a day, no judging, y’all just have more experience than I do with weed).

    • Ladyy

      Blah I basically forgot to mention the courthouse is gonna drug test me. But that just goes without saying.

      • WMan

        Stop smoking, exercise, and drink lots of water. THC is stored in fat so you want to try and eat healthy and get rid of the fat that you already have on your body basically

      • Andre

        From my experience, they dont test you at court, only if on probation and judge recommends it, i think you’ll be fine!

    • Court

      drink a regular Red bull & water .. Red Bull contains Niacin .

    • killsauce

      u failed… 4-6hits everyday means your a heavy smoker.. need at least 30days clean or u better start running 20miles a day to work it off

  • jana

    if ive only smoked joints a handful of times in the past two months, will i be able to pass a drug test by aug 10th? i used to be a heavy smoker, but i’m trying to get a promotion and they’ve been threatening to issue the test for a while now. i’m 5’8′ 150lbs. this shit is driving me nuts.

    • Dustin

      You should be fine but if I were you I’d be keeping your self hydrated to flush your kidneys/bladder and run or workout enough to induce sweating a few times a week.

  • niKole

    Smoke weed 5 weeks ago i took a detox since then called the cleaner have to take a hair test what are the chances

    • killsauce

      ur fucked

    • Dustin

      Yeah you are going to most likely test positive.

    • mikey

      get a hair cut lol but they may ask why you cut it

  • weezer

    6 ft 5 ..180 lbs smoke everyday how can I rid system of thc for urine test….haven’t smoked 2 days and drinking anti-oxidants and certo?

    • Noah

      Buy Palo azul. Either leave three spoonfuls for every 2 quarts ( an oz of azul in a gallon jug) and let sit for a day or until you see a blue tint on the surfacing layer. Drink from 3 days before to even 2-5 hours before test. You have a 2 hour gap ( or your second piss after consumption.) If you boil it, make sure its stainless steel, as aluminum can alterthr teas properties.

  • joe

    I smoked last Wednesday took like 3 hits thats only my second time in years I may have to take a piss test at work today u think ill be good or should I start looking for a new job lol

  • jennie

    Last Thursday 7/17, I took two small puffs from a bowl after not smoking for months ( & not often back then ) weight is 127, 5´3 . Drink tea constantly & am always on the run. Will I test clean tomorrow 7/23. That’s a Wednesday?

    • Dustin

      You’ll be fine, if I were you I’d run today/tonight and try to sweat as much as possible but you should be fine.

      • jennie

        Thanks Dustin, can’t have my pain clinic catching on, smoking helps the pain! Wish he would prescribe that, it really does a lot of good. Think I’ll get a test from cvs to be sure since my condition prevents the running you mentioned!

  • Doug

    I stopped smoking yesterday I have a piss test in September do you think I’ll pass? I weigh 155 and I am 6’7

    • Shocked

      You’re 6’7 & you only weigh 155??!?!!!

      • Doug

        Yes it’s not healthy but I need to know if I’m going to be ok :/

  • Justin

    I usually smoke three times a week. Haven’t smoked in two days and I usually drink 1-2 liters of water a day. I just had a surprise urine test. End of me?

    • steven

      youre done son

  • GibsonHacker

    5′ 8″ I have been smoking for the past 8 years I smoke about 3 grams of Dabs per week. Ive been clean now 14 Days. How long shouldi wait to be clean???

  • Sarah

    5’6 – 140 – I’ve only taken about 5 dabs in my life, I took a dab on Saturday morning and been drinking water & Capri sun since. It’s Tuesday afternoon, now. Would I come up clean?

  • Drizzle

    I weigh about 145 lbs I am 6′ even. I smoke maybe a bowl a day at night. I haven’t smoked in 2 days and I believe I will have a drug test by the end of the week. (urine) do you think I would pass or should I start looking for another job.

  • kid

    I weigh 170 and 5’5. I smoked like a quarter of a gram 10 days ago and have a urine test tomorrow. Will I pass?? I’m freaking out

  • thatoneguynooneknows

    im just wondering, what type of user would i be if i smoke every now and then? i smoked yesterday and i dont think i will have a drug test fro wrestling but im not sure. last time that i smoked before that was probably around 10-20 days ago. i dont ever buy any but if my sis and her bf have some ill usually take a couple hits like 3-6. would i be a frequent user? btw im 5’7 and i weigh 200 and im a little chubby. i can easily becnh 120 lb and sqaut around 170 if that gives you and idea of how much muscle i have.

  • Angie

    Hey guys I’m back. In 10 days I’ll complete my 90 days do you guys think I will be clean then or till a few days after (hair test)

  • Shaun

    I need help, can someone who actually know what they are talking about PLEASE reply. I smoked everyday for the last two years. Stopped Monday, July 14th (9 days ago) and have to report to the Army MEPS for a drug test Next Monday, July 28th (6 days from now [exactly 2 weeks since i quit]). I Take Niacin vitamins everyday (flush) and it makes me sweat a lot especially because i work out 3 times a week. I also drink about 3 bottles of water A day. I am 5’8, 165. Is there anything i can do to be more sure, & do you think I Will i pass this test?

    • battlescar

      they take blood at meps and will find everything

    • Jay

      youll be fine meps doesnt test the blood for any drugs as long as you workout for a week and drink water to clean up your urine you should be fine. Im a marine and have been through multiple meps drug screens

  • Jynx

    Can Someone define these usage ratings, i think i am a moderate user but not sure, i smoke almost everyday but only very little, just a poke or two, i call it my “coupla beers after work” equivalent. am i heavy or moderate? or Frequent?

  • Karen

    I have a urine test tomorrow for walmart and i smoked but only took like 4 hits of a joint. It was very potent. Ive been clean for 20 days and was clean for a month and a half before that. Im 5’9 and 300lbs. Can you tell me if i could or will not pass my test? Please and thank you.

  • Heidi

    Hi I last smoked I smoked daily for a long time June 10 and my weight is 190 and height 5″4 how long will it take for me to pass a urine test ?

    • heidi

      Sorry about that I smoked last on June 10 and had smokef daily for a long time.