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

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.
  • Steven

    Im 5’10 and my weight is 184 but im a frequent smoker but for real im want a job and i need to clean my self

  • Shifts dish

    I smoked 5 bowls with my cousin for the first time sence the beginning of summer and that was 10 days ago will it show up on a pee test?

  • Kai

    Been smoking about 5-7 cones a day for about a year anyone know how long it will take to get out of my system i weigh about 60-70 Kilos

    • WhyIsThisIllegal?

      kai-Sorry for the bad news but it will take a long time to pee clean. I would guess 25-45 days.

  • Bryan

    I smoked today for the first Time in a month . I’m 6’1 230 but I’m more muscle then fat . How long will it take for weed to get out of my system ?

  • thirdiii

    smoked almost 1 blunt yesturday night how long will it stay in my system, for like a pee test?

  • easy

    it usally stays in your system for 7 days.

  • benzo

    I use to smoke every other weekend but not alot and I stoped for two weeks and I took like to hits of a joint how long till thc is out of my system for good?

  • TexasRanger

    Alright so my roommate finally talked me into smoking. Got decently high, ate half a bag of Doritos, and passed out. That was last Wednesday, I took two or three hits the Saturday before but didn’t get high, and drunkenly tried to smoke this Saturday but I’m pretty sure I didn’t accomplish much. Fast forward to today, got a call and was offered a job on the spot. How can I make sure my test comes back clean? I’m 21, 6′, 185lbs. Athletic build, and I’m in the gym 3-4 times a week. Should I be worried? I haven’t scheduled the test yet, trying to put it off but don’t want to be suspicious

  • matt

    so if i smoked weed everyday for the past couple of months, how long will it take to get the thc out of my system, so far im about a week clean

  • loulou

    I smoked about a week and a half ago I have a drug test tomorrow. Will it show I’m positive on the drug test. I’m 5’1 and weigh 120. Let me know please..

  • Nice guy

    I have a drug text coming up I been drinking water a lot and sweating it out I smoked a week ago I am 6’4 and 220 pound please let me know if its still in my system

  • Tedra Johnson

    ? I went to jail on august 14 got out september 17 I smoked to joints on the 18th do you think I’m clean yet can I pass a drug test I weigh about 250 and I’m 5’6 plz tell me