dude, write a fucking better topic!!!!! GRRRRRRRRRRRRRRRRRRRRRRrrrrrrrrrrrrrrrrrrrr.. i hate it when people make stupid ass topics, or the topic is the first clause of a sentance.... GO TO SCHOOL AND LEARN ENGLISH... 2nd complaint, you need to define what you are asking to stay in your system... 3rdly, if you're asking about THC/Pot, then you need to indicate how often and how much you smoke. In general, a toke to a joint's worth might last in your system anywhere from 6-14 days... If you smoke regularly (every day or every other day) for a few weeks, it will be about a month... If you smoke regularly, and are "heavy" or not very active, it can re-appear often over the span of months.