I don't like smoking. I smoked all through high school and quit upon graduation; I didn't want to take the habit to college with me. I can't stand the smell of cigarette smoke; it makes me want to vomit. That said, I don't really care to be around cigarette smoke. Sometimes I am, simply because I have friends who smoke, but generally I avoid it, and choose to live in a town where smoking is not allowed in bars and restaurants.
People aren't bad if they're smokers. They're bad if they're obnoxious about it, and don't take other people into consideration.
As for the issue of ETS around children, one of the biggest illnesses we haven't mentioned is asthma. ETS causes asthma in children who have not previously exhibited symptoms (
http://www.epa.gov/smokefree/healtheffects.html) and it makes it worse for children who already have asthma. Having worked with children with asthma, I wouldn't wish it on anyone. There are so many illnesses that children are at increased risk for if exposed to ETS...so don't do it.