I'm very sensitive to cigarette smoke, to the point where I can smell a cigarette being smoked from several rooms away, or even in another apartment of a residence. The smell of a person who smokes reminds me of an ashtray, while I certainly prefer those whom smell fresh and clean. But not only is it a turn-off for me in person, but even when I view a picture/video of a handsome man online, if I see a pack of cigarettes anywhere within the frame, not to mention actually in his hand, I immediately lose interest and move on to the next. It even bothers me when walking down the street, for someone to be smoking while walking up ahead. It just feels to me as if they are spewing this toxic gas with no regard for those around them.
That being said, I have known some wonderful people who have smoked nearly their entire lives, and have also known a few who have died as a result of having done so. Ironically, I often encourage those who really enjoy smoking to just continue doing so, although preferably, not around me.