It's not that the smokers think they're cool, it's just that nicotene can get addicting as hell. I was addicted to cigarettes back in high school myself.
Almost everyone I know smokes and most of them can't go a day without 5-6 cigarettes at least. When I was 14-17, I was like that too. My parents would buy packs for me all the time, so I had plenty to smoke. When I didn't have em, I bummed them off of friends.
Trust me in saying when I smoked like that back then,I sure as hell didn't think of looking cool. I was thinking,"Damn, I needs me a smoke cause my brain wants nicotene!".
Nicotene, though, lowers my blood pressure too low and I can feel like shit if I smoke too many. Drowsy.........
I've since found a better type of smoke for me since then. When I work, I still want a cig or two, though.