Jan 052013
 January 5, 2013

Pass Your Test The 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.


    • kendrix

      Yes if its a urine test. Just drink a lot of water and cranberry juice and be active like run r weight lifting to sweat. U should be good. But hair test idk

  • Jimbob

    I haven’t smoked in nearly 5 years and about 4 days ago I had 4 drags off a joint. Will I be alright for a drug test I’m 5’10 and roughly 175 lbs?

  • kendrix

    Please somebody help me out like two r three weeks ago I took two puff of a joint and they wasn’t heavy puff I barley inhale and it was my first time it didn’t even get me high I’m a male 15 and weight 120. I got to take a hair test do u think I will pass please somebody response I need help

    • porknchips

      90 days for hair folicle

  • jennibee

    I’m 23 years old. I smoke generally every night, but I only take one hit. I weigh 93lbs and I haven’t smoked in 3 days. I meet with my parol officer on June 7th. Should I still test positive then should my system be clean?

    • Mel

      Yeah, you will be clean.

  • Doubtful

    I smoked April 19th for the first time and took one hit. Took a drug test may 18th. Do you guys think I passed?

  • birthdayoops

    So I took 4 hits on my birthday(may 2nd) its the 20th now it was the first time I got high in months. I have a drug test for a promotion in a week. I’m 5’4 and 250 pound female. I don’t know if I’ll pass…

    • Azhar Qazi

      Try some dry fruits nefore test…

    • Joyce

      Did you pass

  • Alex

    Hey guys. Please help me!
    I smoked for the first time since January on April 11th but just a few hits (3 or 4). I’m 5″4 and 100 pounds. I have a urine drug test tomorrow. Will I be good?

  • Gabe

    Hi i used to smoke about 5 days out of the week for a couple months and I would go through a little more than an eighth each week. I haven’t smoked in 3 weeks and I have been running everyday for the past 2 weeks, I have to take a drug test soon so I have taken two at home drug tests (about 25$ each) and both times a very faint line came up saying I was negative, but I am nervous because they are faint. Do you think I would pass my drug test if I took it this weekend?

    • Paul

      Yes. I’ve done the same thing in the past. I had to take a drug test and considered myself a heavy user. I took the at home test to make sure I would pass. If you see a faint line then you have nothing to worry about. If you are paranoid about not passing, just drink plenty of water/gatorade

  • Chris

    I have a drug test coming up tomorrow. I have smoked before in the past but i’m not a frequent user. The last time I smoked was the night of the manny/mayweather fight, i’m thinking it was the third of may & it was only about 3-4 hits. Does anyone know if I should be okay for the test tomorrow? Hair & Urine test since i’m not sure which one i’ll be taking.

  • Puffin

    Hi, so um i smoke for the first time about three maybe three and a half weeks ago and it was roughly a gram worth, I am being drug tested today I am 5’3 and 107 lb. I’m pretty sure I will pass, but not sure. Will I?

  • Tay

    Hey, I’m 6’0 175 and I’ve smoked twice in the last month. One time being last week and the other time was 3 weeks ago if I drink a lot of water and cranberry juice can I pass my test next week? Especially since I exercise and sweat a lot .

  • Ryan

    I’ve smoked an average of 6 days a week for the past 4 months, but only 1 small to medium sized hit each night (I use it as a sleeping aid), about 6g in total over those 4 months (high grade, 4/5 potency). I’d describe it as just enough to get a heavy buzz, not quite a full-on high. If I stop today, about how long should it be until I can safely pass a urine test? What about a hair test? I don’t know which test I’ll be taking yet. 6’1″, 140lbs. Might go get some flush-free niacin, and get some better exercise. My diet is already very low fat. I’ll be picking up some at-home urine tests just to be sure.

  • pun

    Hi I’ve smoked 3 times this year twice in January and once in march about 4 puffs each time I have a hair test in mid June will I pass?

  • Ryan

    Excellent, thank you. I do drink a good amount of green tea, so that’s good. I’ll pick up some slow release niacin and try it out. I’ll also be as active as I can and consistently drink water. Good to hear that 3-4 day estimate.

  • jsmoke

    I weigh 273, I was an every day smoker, about a bowl of dispensary quality every day. I stopped on May 15th, and have a UA for a job on June 8th. A little about me, In jhanuary I was 340lbs, and have been eating right and exercising daily to lose over 70lbs. I’m still eating right (about 1k calories a day, 60% protein, mostly chicken and steamed vegetables), and exercising (I do Focus T25 because it fits in my schedule). I’m wondering if I will be clean by my test on the 8th. Any ideas?

  • King Duke

    Can marijuana get in your system by just being around it

  • Jay jackson

    I hadn’t smoked in years took a couple of bong rips back in march And shared a blunt on the 23 of this month i weigh bout 170 lbs but water has been my drink of choice just afraid to be randomed please help….trucker black

  • megunis

    I used to smoke everyday (go through maybe an eighter a week average) for 5 years with no breaks longer than a month. Got popped and took a drug test after 10 days of being completely clean and was good. Female with average to fast metabolism weigh 140lbs. Also during that time drank water with lemon and took cranberry and milk thistle