+1 to have a stroke to quit: One of my older relative quit that way, because of resulting disability, was unable to go to the store and buy cigarettes or even just light one and smoke it.

Really, you can talk to your doctor and get meds, or just be really stong and quit. From what I've heard, it gets easier over time after you quit, but you can't ever relapse or you'll just begin the process over again.