Bupropion
"I smoked 35 years before started on Bupropion. I took 150 mg for 3 days,  then took 300 mg for 6 weeks, I quit on day 5.  Quitting was pretty easy, the medication changes the way the cigarettes taste and also you will legitimately forget to smoke.  When I went to stop the Bupropion I eased it back to 150 mg for 3 days and then 150 mg every 2 days for 6 days and 150 mg every 3 days for 6 days.  I had no withdrawals from this drug.  I have successfully quit smoking for 4 months now.  I think about them less and less and have had no physical urges to smoke since the first week I quit.  The Bupropion worked great, my daughter has also quit using this medication.  Highly recommend."