I've been smoking since I was 13 (about 5and half years)
I managed to quit about a year and a half ago. I made it about 5 months.
Then one day I was at a funeral (A friend of mine was in a car accident, but that's a different story)
I was standing with a friend who was having a cig, I felt like crap and for some reason was craving.
One cig didn't make me feel better. Neither did two. Neither did a pack. And now a year later I'm paying the price. (again)
The fact is that the cravings never really go away. Ask any ex-smoker.
(I only managed to quit that one time because I was in a hospital for two weeks)
I'll never forgive myself for having that first one when I was 13. I'm in bad physical shape, I cough all the time. My friends tell me how much I smell of smoke, I have to stand alone in the rain when my non-smoking buddies are sitting in the warm
Oh and don't forget the thousands I've spent on it. (Plus additional money I spend on mints)
Take it from me. Its a bad idea, one you will live to regret. Most of the guys I know who smoke started off on "one pack a week" or "one on the weekend". But that "one" becomes "two" or "Better have just one before my interview" etc. until you don't make the decision any more. You just need as many as you need.
You probably won't end up listening to most in this topic, you'll either smoke or you won't.
Just try and think of what you would do ten years down the line. Believe me its something you will regret, and it takes much more then "will-power" to stop.