Varenicline
"It works, but definitely has side effects.  I started in early December and quit on January 2nd.  I experienced the dreaming (kinda liked it), extreme nausea (didn't like that), and the mood swings.  I decided to stop taking Chantix as the mood swings were getting worse.  I still haven't smoked, which is a feat for me.  I think all I needed was to brake the repetition of the habit.  "