Nicotine is a drug. Like a lot of them, it has a range of effects. Some of them are pretty nice. You can't separate them from the giant mountain of bag effects, but still. Pretending that the only reason people ever smoked was addiction is dumb. It's why they kept smoking, but that's a whole nuther thing.
Man, a a good smoke when stressed helped. It didn't make the stress go away, but it it sure as hell sharpened focus and muted the sense of futility when a problem was overwhelming. I sure as hell won't ever smoke again, but I miss the hell out of that.