First of all, how many teenagers are the kind of frequent flyers who would use FlyerTalk? Probably not very many.
Secondly, I will merely observe that nobody posting here has ever suggested that he or she might take up smoking if FlyerTalk creates a smokers' forum. No, it's never one of us. We're too smart for that! It's always some other guy -- someone so gullible or easily influenced that the existence of a smokers' forum here might push him over the edge into smoker-land. Do such people actually exist? Or are we worried about fantasy creatures like unicorns?
Sure, some people smoke. Smoking is a serious health risk, beyond debate. But what does FlyerTalk have to do with that? Doesn't FlyerTalk simply exist in a world with smokers, neither creating nor encouraging them? And is FlyerTalk responsible in any way for discouraging smoking? I don't think so. Smokers get plenty of discouragement already from other sources.
Bruce