I've smoked on and off again since high school, but I've pretty much stopped altogether now. There were a number of influences for me stopping, but really, I kinda feel like the reasons I stopped were (comparatively speaking) pretty dumb.
I didn't stop because of my dad, who told me "You can get arrested. You can wreak your car. You can have kids. Don't smoke cigarettes." I didn't smoke for my girlfriend, whose mom's side of the family all smokes (and other things....)
I stopped because it was too damn expensive, and I lost the taste for it!
A normal pack is around 6 bucks now. A pack a day makes this habit cost $42 bucks a week. I can't afford this! So, one of the things you can do is save the money you would send for cigs, and buy something nice for you as a reward, like a good dinner, or a video game, or some new clothes.
The taste thing happened after I caught a cold. My smokes just started tasting flat, like I was smoking postcards or something. After that, I realized, "Man, this sucks...." I threw my pack away, and that was that.
Good Luck, You can do it!