ok dude i work in health care, here is how it works, if you are an every once and a while smoker, it takes 3 to 4 days to get out of your system. if you are a once a week smoker it takes about two weeks. for it to take a month to get out of your system then you would have to be smokin that shit every other min of the day. your blood would have to be liquid T.H.C.