Pay heed to these responses folks, here's where the truth comes out. Smoking bans aren't about public health at all; they're about aesthetics. It's worse than a "nanny state" mentality, it's public policy by yuck factor.
It's just a happy convenience for anti-smoking folks that there's a (possibly very flawed) public health argument in favor of their particular olfactory preference.
HunterWagner and Samtropy simply don't like smoke, so they want to ban it. I don't like smoke either, but I try take responsibility for myself and attempt to stay away from it.
When they came for the pot smokers, I remained silent. I was not a pot smoker. When they demonized veal and banned pate, I remained silent. I didn't eat that stuff. When they came for the smokers... What's next?