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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.
For 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.tâs estimated that THC can have a half life that ranges anywhere from 1-10 days. Itâs 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.