Me!
Actually Warwithscars, acording to that logic, food is also bad because some people overeat, get fat, get diabetes and heart disease and just ruin it for the rest of us. Cars kill more than anything, guess those are out too.
The majority of accidents occur within a mile of home, so I guess home is bad, better avoid it. Breathing the air in most major cities can eventually kill you so we better stop that too. Clearly this can be taken to idiotic levels, so why not let everyone make their own decisions.
I happen to know tons of people who smoke pot in moderation and don't feel the need to mainline heroin. Yes, there are those who do, but that's THEIR responsibility. I don't know anyone who could smoke enough pot to stunt their growth, can you really imagine someone smoking a pack of joints a day? Two? Three? Isn't penis size pretty much determined by childhood? I don't think there's any rational evidence that smoking pot will stunt your growth in adolescence, and afterward it's too late. Shrinking? That's just flat out funny.
Not advocating one way or the other, but I do get annoyed with the condescending attitude that we should all be held back to the standards of the stupidest amoung us.