I smoke around a pack a week, not too much but still pretty bad. It's a horrible habit, but I also drink. It's hard to understand if you don't drink but when you're drinking beer the taste of a cigarette goes perfectly with it, and that's what got me hooked. All of my friends smoke also, so it's really hard to not want one when they're smoking. My lungs are forgeted right as its winter break and I've been partying every night.
DO NOT start smoking. It's fun for the first year, but after that it's a regular thing and you'll find yourself getting anxious when you don't have one.