I admit I first smoked when I was a teenager, new to drinking etc. and had a smoke. I only did it when a certain friend was around who always had cigarettes on him.
Then I didn't do it for a few years, but then one day it was really sunny, and I was in the park reading/studying, and I thought it'd be nice. So I bought a pack (Marlboro Lights) and had one or two, and it was nice.
Since then I have maybe one or two a week, so a pack lasts me ages. Mind you, they're usually stale and bent out of shape by the end as the softpack's always just stuffed in my bag, but I don't mind.
So yeah, I started smoking because it was new (not necessarily 'cool', but something I wanted to try, just 'cause) and now I smoke one or two cigarettes a week if I'm relaxing, or taking a walk. I've never taken a break and had a cigarette, or felt the need for one when I feel stressed. It's always when everything's nice and calm and I'm just chilling out and I'll have one