I don't smoke cigarettes. It doesn't bother me if someone does, its fine w/ me just as long as it ain't done in my car and they don't blow it at me.
Both my parents smoked, my grandmother quit cold turkey after she had to get operated on back in '95. My step mom and step sister smoke, but my old man makes them do it outside, and the girl I'm dating now smokes. It never bother me as long as they follow my 2 rules about it.