smoking cessation
"I was a 1/2 pack a day smoker when I started taking Chantix.  Took it for the first week before I quit smoking and had no side effects.  After quitting smoking I did notice that my dreams were quite vivid but not necessarily unpleasant and I was passing gas with increased frequency.  I quit taking Chantix after the first 5 days of quitting smoking.  It helped immensely during the first 3 days of quitting - no physical cravings at all -  but I found at day 4-5 that I was starting to feel very anxious as if I had just quit smoking.   I am now 6 weeks without smoking.  Many of the "side effects" of Chantix read to me as they are the side effects of quitting smoking as I am experiencing them as well.  Most notable - I feel less happy."