Bupropion
"Smoked for 43 years 2packs a day tried to quit with patch, hypnosis, chantex didn't work for me .  I went on bupropion 2 times a day for three days bad side effects but after 3 days all side effects went away .  I smoked for three weeks on the medication and quit. It was not hard to quit I was on the medicine for a total of 2 months quit the medicine and have been smoke free for 6 months ."