Bupropion
"The first week I had some very brief agitation (day 4) that lasted for about 30 minutes.  By the end of the first week, my cravings were nearly gone.  I am down to only 1 to 3 uses per day, which is a major reduction for me.  I plan to be completely done by day 20.    No other side effects.  Not feeling any nicotine withdrawal symptoms.  I plan to use the Wellbutrin full strength for 1-2 weeks after quitting entirely and then begin the taper process.    Amazing product."