Smoking cigarettes is sth people who wanna supress their emotions do, at least in my experience. It's like, when **** hits the fan and you are so stressed you are willing to shorten your life sucking on a practically cancer pipe. It is the same with alcohol drinking and the same with drug use. I think it is a trait of generally weak people who so badly wanna kill the mental pain they have from a certain event in their life that directly resort to the quickest solution: put a cigarette on your mouth and smoke it.
I never smoked, drank or did drugs myself. Whenever I am angry, stressed or anything of the kind, I use natural ways to supress it: lay in my bed, kick hard with my legs and hands all over the place while I scream; go for a walk; go for a run; play some football (soccer, not the American one); listen to music; talk it over with someone.
Smoking chicks is not simply smoking chicks. In either case, they're either doing it to be cool which screams immature/stupid to me from far away OR they are doing it to kill the pain/misery/stress/disillusions of their daily life which screams to me they are weak people in general and probably have an habit of falling pray to different substances later in life once faced with stressful situations. I don't date them, I don't wanna be anywhere near them. I try to hang out with people who don't smoke and I do so almost all the time.