Throw out all your lighters and ashtrays.
Clean your house if you smoke inside, this means vacuuming, dusting/wiping ash away, washing all your clothes, and air freshening. Make it a pain in the ass, so if you smoke in the house you just undid a bunch of hard work.
Do the same for your car, wipe down everything, air freshen, and vacuum.
Brush your teeth every time you feel like smoking.
After the above is taken care of, avoid buying them and you are pretty clear. You will be tempted to get a pack every once in awhile, but stay strong and don't.
The hard part then becomes socializing with people who go for a smoke every hour and of course going out for a night and getting hammered.
Stay the course man, you'll feel so much better, perform better, and probably look better.
Don't worry about it affecting body comp either. The people who get fat after quitting are those who eat a bunch of crap and sit on their asses for recreation.