I voted un-cool. I smoke in the evening and during weekends myself though, mostly because it's just delicious, even though it's absolutely disgusting. It's hard to explain why you smoke, you have to be slightly addicted I guess. But a beer or coffee with a smoke knows no equal.
I've stopped a few times for a month or so, with the knowledge that I don't care to much if I continue smoking. And yes, after that period I returned, just because it's quite delicious. Regardless, smoking does not really make you cool nowadays, perhaps if you're still at high school.