I guess we're all learning slowly that just about anything can kill you. Flouride poisining, water intoxication, smoking, driving your car, etc. Just because it
can, however, doesn't mean it
will. Sure, I notice some effects from smoking (although Chris...I was never much of a distance runner. Even when I was in excellent, non-smoking shape I could sprint like hell but that was it), but it's obviously not enough to make me stop. And Rob...I'm not sure who you know that inhales cigars, but that's just about unheard of and incredibly disgusting. Cigars are all about flavor, they're not meant to be inhaled. Even I wouln't inhale a cigar.
Personally, I don't care what you do as long as you doesn't hurt anyone and you take personal responsibility for it.