Is there any way to Quit Smoking?
There are loads of support groups and advice centres etc that can help you. Your GP probably has advice and you can buy gum or patches to ease the cravings. If you have the guts, do what my dad did and just NOT SMOKE AT ALL. It really does take self dicipline though. Or you could gradually day by day decrease the amount you smoke. I applaud you for wanting to quit.
Will power, combined with help as said above... unfortunately i have no will power, i wish i had.
Try and start a good exercise program, slowly replace smoking with that.