When you ask the question How long does marijuana stay in your system? you need to take into account the fact that there is no simple answer to this question. Quite simply, its argued both that THC never leaves your brain, as well as that there are several different factors which can affect whether or not you test positive for marijuana use.

The speed at which marijuana leaves your body depends both on the speed of your metabolism, as well as on the half life of THC. Unlike most other substances, the half-life of THC can vary quite a bit, depending on who is using it, when its used, and several other factors. For example, its estimated that THC can have a half life that ranges anywhere from 1-10 days. Its almost impossible to find out what that half life is, which means that it is very difficult to use it to calculate how long it will take for all of the THC to leave your body.

Not only that, but your metabolism and how much marijuana you smoked will also have an effect on the length of time that it will take you before you can test without testing positive for marijuana use. After all, the half-life is only the length of time that it takes for you to lose half of the THC that is in your system. If you’ve smoked a lot of marijuana, then it will take you longer before the THC in your body drops back below the amount that is detectable by most drug tests.

For this reason, when you ask How long does marijuana stay in your system? You have to realize that its very unlikely that youll be able to get a usable answer. The most common period of time is anywhere from 3-30 days, depending on your metabolism and the amount of marijuana that you’ve smoked. This is unfortunate, since it means that while most drug tests can only turn up evidence of other drugs if you’ve been taking the drug within a few days of the drug test, marijuana could still be detected in a urine test up to a month after the last time it is used.

Hair tests are even worse, since your body stores THC in the hair follicles. For this reason, the previous answers to How long does marijuana stay in your system? are only useful if your going to be forced to take a urine test. For the hair test, depending on the amount of hair that the company takes, its possible that marijuana could be detected up to three years after the last time that you smoke.

If your worried about testing positive for marijuana, then you should definitely invest in some of the great products that will help you to test negative for marijuana use. This is due to the fact that it takes so long for the THC to leave your system that you’ll probably test positive if you do not. If you don’t have an entire month to wait before you need to take the test, then you should definitely think about some other options to keep from testing positive.

Drug detection depends on the ingested amount, elapsed time since use, rate of metabolism, and amount of fluid intake. Because of these variables, the times presented are only a general guideline.

Drugs detection times for Urine test

Drug Detection times Usage
Alcohol 1 – 10 days Oral
Nicotine 1-7 days Sniffed, smoked, oral
Mescaline 1-7 days Oral
Marijuana 1day – 11 weeks Smoked, Oral
Hashish 1day – 11 weeks Smoked, Oral
Psilocin (mushrooms) 1 – 2 days Smoked, Oral

Drug detection times for Hair test

The standard hair drug test is a proven procedure which not only detects drugs that have been used, but can also provide information on the quantity of drugs consumed and the historic pattern of drug use. A drug history can be obtained from the hair of any individual. Drug use can be detected for 3 to 6 months depending on the length of the hair sample. It takes approximately 5 days for drugs to show up in a person’s hair.

Drug detection times for a blood test

A blood test is expensive and not very common. The detection times are much shorter then those of the other tests and vary between two days and two weeks.