I am amazed at this thread, how can i put this... smoking pot is bad for you!! Even without tobacco u are getting a ton of tar )weed has more tar than tobacco) , caricogens etc. Yes of course it can help to cause cancer you are inhaling smoke for gods sake. Its ruining your cardiovascular health which is so important to being able to withstand a hard workout.
BTW its nothing to do with it being ilegal nothing at all.