It is sometimes really funny when experienced marijuana users, ask the question ‘how long does marijuana stay in your system?’ when they get in trouble and are about to take a drug test to prove they haven’t had anything illegal.
This just shows how much you need to know about the marijuana you use, how long THC metabolites last in your system and ways to ensure it isn’t detected even when used not long enough for it naturally leave your system.
To be honest, there is no straight forward answer to this question as different factors lead to varying results. The only way to know if you have marijuana metabolites in your system is to carry out a drug test using Do-It-Yourself drug kit which is very easy to purchase and use.