I enjoy it sometimes, so I smoke sometimes. I find straights unappealing and tasteless but rollies are quite nice on occasion, the mixture of sensory inputs amuse me and it gives me something to do. I actually dislike the effects of cigarettes, the nicotine is at best a distraction and at worst an unpleasant buzz getting in the way of my head.
That's not the only reason though, I smoke weed with semi regularity and smoking the occasional cigarette helped me cope with the negatives of the nicotine rush which I occasionally experienced while smoking weed (only more severely because of the high). So I smoked a little to get used to the feeling as well.
As for the negatives, I don't particularly care about the damage to my fitness, cancer of any variety isn't overly concerning to me and that doesn't leave much to worry about when you're smoking on occasion. Oh heart problems I guess but again I don't really care. I'm not hung up on living so much that I avoid things I enjoy I guess.