Bupropion
"I never write reviews but this medicine has worked so well for me.  I've been on it since January 2nd and have cut down smoking by more than 3/4.  Yesterday I only had 2-3 cigarettes and they weren't even completely smoked.  It's weird because you still think of having a smoke now and then but have little desire to actually go have one.  Each day gets better and you have less and less desire to actually smoke even if you think about it from time to time.   No side effects.  Would pay 10x more if I had too for this."