How Long Does Weed Stay In Your System

Marijuana also known as weed is the most widely used illegal drugs. Even though it is proven to be far safer then cigarettes, alcohol and other illegal drugs, it still prohibited. Also, it stays in your system for much longer periods of time than any other illegal drug. On average the weed will be stay in your system between a week and thirty day. However, in some extreme cases thc has been detectable in the body (urine and blood) for up to 180 days. For a hair drug test marijuana can stay detectable forever until that hair is cut.

It is hard to give a precise answer of “How Long Does Weed Stay In Your System?”. There are several factors which will effect the amount of time marijuana will remain present in the body. On average it will be detectable for 3-10 days for a casual user, up 30 days for a persistent user, and up to 90 days for a chronic marijuana user. Here is a chart as below:

Marijuana Detection Times Chart

Unfortunately, there is no exact formula to compute how long it takes a body to clean the system of thc. Below are some guidelines to estimate the detection time of weed.

If one or more of the following applies Your system will be clean of marijuana in
  • You use weed only occasionally (less than once a month)
  • You have been using pot for less than three months
  • You smoke weed that would be approximately equivalent to one joint or less
  • The pot used is of average potency or less
10 days
  • You use weed a couple of times a month
  • You have been using weed for three to six months
  • When you use, you smoke an amount that would be approximately equivalent to one joint or less
  • The weed you use is of average potency or less
20 days
  • You smoke weed once a week
  • You have been using pot for six months to one year
  • When you use, you smoke an amount that would be approximately equivalent to one joint or more
  • The weed you use is of average potency or greater
30 days
  • You smoke pot almost every day
  • You have been using pot for over one year
  • When you smoke pot, you smoke an amount equivalent to one or two joints
  • The weed used is of average potency or greater
30-60 days
  • You smoke weed daily
  • You have been using marijuana for more than one year
  • You smoke an amount that would be approximately equivalent to two joints or more per day
  • The marijuana you use is of average potency or greater
60-90 days

Below we discuss the factors to consider in which marijuana (weed, thc) will leave the body. However, we suggest that you purchase a marijuana drug test kits to test yourself to make sure you are clean of thc before any marijuana drug test.

Factors Which Affect Marijuana Presence in Your Body

  • Amount of Marijuana Used
  • Quality of Marijuana
  • Metabolic Rate
  • Body Fat Percentage

Amount of Marijuana Used

For a first time pot user, thc will remain detectable in the system for a period up to 7 days. For some casual weed user who have smoked weed 2-3 times each week, thc can be detectable for a period up to 21 days. Chronic users who smoke pot everyday can expect to excrete thc toxins for up to 90 days. This is an extremely long time for such a relatively harmless drug to be detectable in a drug test.

Quality of Marijuana Used

Currently t he marijuana found in the United States has a THC concentration of around 8.5%- 9%. In the early 1990s the thc concentration was around 3.5%. It is estimated that marijuana sold in coffee shops in Amsterdam has a THC concentration of around 19 percent. Since marijuana comes in so many different strength; it is relatively impossible to know exactly what level of THC concentration a person is ingesting when using marijuana. If a casual user were to smoke an incredibly potent strain of marijuana, it would have the same effect on THC content in a person’s fat, as if a chronic or daily user were to smoke a less potent strain of marijuana, and thus take longer to excrete out of the system.

Metabolic Rate

This rate is the rate at which your body run. You can think of a Ferrari and a Buick. A Ferrari runs must faster than the Buick so it will go through gas that much faster. This is similar to your system when it comes to marijuana. A person with a faster metabolic rate will have a shorter detectable time for thc than a person with a slower rate. That being said, those who smoked weed recently and have the fast metabolic rate will excrete larger amounts of thc than those who have a slower metabolic rate. This is important if you are using a temporary detox product to pass a drug test.

Body Fat Percentage

The fat percentage is critical to determine how long the weed will remain in the system. A person has to be honest with the amount of body fat they have because thc is stored in the fat cells in the body. So the more fat cells that you have the more storage space you have for weed.

Hair Drug Test for marijuana

It takes an extremely long time in order to pass a hair drug test for weed. The reason for this is two fold.

First in order to pass a hair drug test a person must grow hair which is free of thc toxins. So if it takes your system 30 days to be clean of weed then your body will not start growing clean hair follicles until 30 days after you stop smoking pot!

On average hair grows at a rate of .5 inches per month. This test usually requires 1.5 inches of hair, which will test for the past 90 days, (remember hair grows .5 inches a month.) So using this example you decide to quit smoking weed today, and you have a hair length of 2 inches it will take 4 months in order for you to give a 1.5 inch sample of hair which is free of thc.

This is calculated by,

  1. 30 days in order to start producing hair clean of thc
  2. 90 days to grow a hair sample of 1.5 inches

Remember that 2 inches of original hair is needed (removed, cut) for a hair sample.

How Long Do Drugs Stay In Your Body?

Generic Drugs Brand Names Remain in body for
Amphetamines Amphetamine systemic, Biphetamine, Black Beauties, Crosses,
Dexedrine, Hearts
5-7 days
Amylobarbitone Amytal and Amytal Sodium 3-4 weeks
Anabolic steroids Stanzolol, Stanazolol, Nandrolene, Roids 4-5 days
Barbituates Luminal, Nembutal, Seconal, Pentothal 6-9 days
Benzodiazepines Ativan, Halcion, Librium, Rohypnol, Valium; Roofies, Tranks, Xanax 5-7 days
Butobarbitone Soneryl 3-6 days
Cocaine Coke, Crack, Flake, Rocks, Snow, powder,
4-7 days
Codeine Fiorinal w/codeine, Robitussin A-C, Empirin w/codeine, Tylenol 3-7 days
GHB G, Grievous Bodily Harm, Goob, Liquid Ecstasy, Liquid X 3-4 days
Heroin Horse, Smack 7-10 days
Inhalents 2 days
Ketamine K, Kit Kat, Special K, Vitamin K 1-3 days
LSD Acid, Blotter, Microdot, Yellow sunshine, Gel
1-5 days
Marijuana Bud, Blunt, Grass, Herb, Pot, Reefer, Sinsemilla, Smoke, Weed 3-6 days – months for heavy users
MDMA Ecstasy, XTC, beanz, beans, E, X, eTabs 2-6 days
Methadone Dones 4-7 days
Methamphetamines Crank, Crystal, meth, Desoxyn, Glass, Ice,
4-9 days
Methaqualone Ludes, Quaaludes 11-16 days
Nicotine Cigarettes, Cigars, Habitrol patch, Nicorette gum, Nicotrol spray,
Prostep patch, Smokeless tobacco, Snuff, Sheesha, Shisha
7-10 days
Opiates China, Dreams, Laudanum, Paregoric, Dover’s Powder 6-8 days
Oxycodone OxyContin, Percolone, Roxicodone, oxys, oxies 7-10 days
PCP Angel Dust, Boat, Hog, Love Boat 2-7 days