All I can say is that I am happy I never really started.
I tried when I was 15 and even owned ONE package that I bought myself (and finished almost), but it was then that I started wondering WHY I was beginning to develop this (which never really became a habit, mind), and found out I was doing it for the others, but definitely not for myself and my own good (felt miserable and sick to the stomach EVERY time I had smoked). So I stopped there and then and told myself that those who don't like me without a cigarette in hands were not going to like me any better WITH one, and those who already had liked me as a non-smoker would also continue to do so.
I saw in my best friend how hard it is to break the habit, so my admiration goes out to everyone who tries, and more even to who succeeds ... this best friend of mine hasn't smoked for the past 12 or 13 years and still says sometimes "Wow, now I could need one!" -- it is such a hard thing to break free from!
So: big thumbsup to all those who try to or have even succeeded in stopping! And a "Try to at least try" to those who would like to drop the habit and can't seem to do so.