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So, we call this approximate calculation as half life. If you have smoked marijuana then the drug will stay for 3 to 30 days. This is normal for the common drugs. But in the case of marijuana, this can be detected even after a month in Urine drug test marijuana.Marijuana will stay in your system for 10 days if you have been smoking occasionally.If it is smoked on regular basis it will be there up to 45 days and if you smoke constant pace then it will be in the system for as long as 90 days. http://clnk.me/1yc0I.o, we call this approximate calculation as half life. If you have smoked marijuana then the drug will stay for 3 to 30 days. This is normal for the common drugs. But in the case of marijuana, this can be detected even after a month in Urine drug test marijuana.
The shelf life for marijuana in the system after one time use is around 12 days. If you're really that worried, drink lots of water and work up a sweat at least once a day until the test. The average pot smoker can clean their system out in six weeks if done properly.or this reason, when you ask âHow long does marijuana stay in your system?â you have to realize that itâs very unlikely that youâll 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 youâve smoked.