Bupropion
"I'm on my second day. Still smoking, definitely not as much. I'm a pack and a half to two packs a day. Been 33 years now, I'm 44. Anyways, first day not much different and I feel like I smoked more then normal. But today I smoked about 10, which is a drastic reduction for me. They taste awful and I actually can't stand the smell. I'm still on 150 mg, I start 300 mg in two days."