Very good advice by killerweed 420. Do as he said because its the best way. Weed stays in your system up to 69 days i believe depending on all the differant factors. Dont ever believe the 30 day rumor because i know for a fact that is BS. I smoked daily and was subject to weekly piss tests because of the oxycotin i was takeing per docs regulations. It took me 56 days to finally clean up. After i cleaned up i was so pissed that i went back to smokeing and put pure tiolet water in the cup. The doc didnt give a shit he just threatend to take me off meds if i pissed dirty and at that point i really could care less. Shortly after i quit seeing that doc.