depends on how you are tested. hair testing can detect cannabis use for months; urine tests for 3-4 weeks. the sensitivity of the lab doing the testing is also a factor. some labs are more skilled at detecting past drug use.
marijuana. i have smoked marijuana for about 1 1/2 months i weigh 130 i have around 1% body fat and my metabolism is very fast and i drink lots of water how long will it take to leave my system.