Marijuana ( pot, herb, weed, grass ) is the most commonly used and tested for drug in the United States and several other countries as well. Marijuana’s effects on the user and detection time depend on it’s strength or potency, which is related to the amount of THC(Tetrahydrocannabinol) it contains.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. THC (Tetrahydrocannabinol) can stay in a person’s body for as long as 3 to 90 days after smoking or being ingested orally. There are numerous determining factors for how long drug toxins stay in a persons body which vary from person to person, such as the analytical method used, your health, your body weight, metabolism, fluid intake, the type of drug toxin, and the degree of exposure to the drug toxin.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. It’s estimated that THC can have a half life that ranges anywhere from 1-10 days. It’s 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.For this reason, when you ask “How long does marijuana stay in your system?” you have to realize that it’s very unlikely that you’ll 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. If you smoke it occasionally it will remain in your system for up to 10 days. If you smoke marijuana on a regular basis it will stay in your system for as long as 45 days, and if you smoke marijuana at a constant pace, it can stay in the body for 90 days, Marijuana is fat soluble. It stores in the fat cells of the body, the brain, the liver, the kidneys, in other words the major organs.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 you’re going to be forced to take a urine test. For the hair test, depending on the amount of hair that the company takes, it’s possible that marijuana could be detected up to three years after the last time that you smoke.If you’re worried about testing positive for marijuana, then you should definitely invest in some of the great Detoxifying Products for removing THC out of your system 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. If you’re not sure how to tell whether or not the marijuana detox is working, then you can also purchase a small drug testing kit.Also it seems to be unlikely they would test specifically for hash – its more orientated to catch diabetes and things like that, unless they say specifically its a drug test.If they do you can just say you went to Amsterdam with a friend. :-)An apparent ‘detox’ is to drink undiluted ribena????dunno if it works – but i saw a post that it did. Apart from that there are other detox regimes you can take which will sort it out.