nah hes right. smoke is a carcinogen, hence not good for you. you can die of all types of shit, emphazema bieng one of them. dont think cancers the only thing to worry about.
for instance...you dont actually die of AIDS, you die of your immune system bieng lowered to the point where things such as the flu can kill you.
i think the problem with studying marijuana is that marijuana users tend to engage in other sorts of high risk behavior. we can kid ourselves if we want, but im not the only nigga in here thats done something stupid when high.