I smoked since I was about 15 (I know), so for over 20 years. I finally quit for good (after multiple tries) December 6, 2005. It was one of the most difficult things I have ever done. But it has also been one of the most rewarding.
It sucks, plain and simple. But you can do it, one step at a time as they say. And it will be a long time before you finally get to the point where you can be around it without craving one. As a result its best, especially early to try to avoid those situations where you know they will be easily available and or very desirable (such as a bar with a friend who smokes). At least give yourself a few weeks without before so you have some time invested and giving in is more easily resisted.
I did it with the help of over the counter patches, stepping down in dose over a few weeks. It did help a little. It also really helps to have some support from a friend or loved one. The last thing you need is some tool of a friend constantly sticking them in your face saying "come on! You know you want one!" etc.
The first couple weeks will be the hardest, but stick with it and keep telling yourself how much money you will save, how much less you will stink, how much whiter your teeth will be, how much less you'll wake up coughing, how much better you'll feel physically, and how you'll be able to lord it over all your friends bragging about your iron will.
Stick with it man, its a long road but it really is worth it. And unfortunately it may not seem that way at the begining, but you will thank yourself.