Quitting smoking is the easiest thing, I've done it for more than 30 times. I think this was a thought of Mark Twain.
I've been smoking since 14(now I'm 20), and I've tried to quit sveral times. Last time was for 2 months. I think the important thing when you are quitting is to remember that there is no such a thing as "only one cigarett", either you are quitting or you are not...because after the first "only one cigarett" there comes another "only one cigarett" and then another and...you see my point.