Like one or two on here, I actually like the smell of fresh cigarette smoke when someone is smoking - not to be confused with the old stale smell in people's homes or cars. I wouldn't want to be in a room with lots of smokers, but when I catch a waft of the smoke blowing into the pub from a smoker outside the door enjoying a quick gasper it's not unpleasant to me.
I have never liked the smell of cigarette smoke and particularly hate that of pipes, but I love the smell of good cigar being smoked - though I have not seen or smelled one being smoked for many years.