smoking cessation
"I used Chantix and completely quit on the 6th day and have not looked back.  That was 3.5 years ago.  I do think Chantix can be dangerous, on the other hand, what could be worse than lung cancer, COPD and the any number of illnesses caused by smoking.  My only side effect was fatigue for the first 2 weeks.  My doctor wanted me to stay on Chantix for 6 months, which I did.  And he had me wean off the over a 6 week period.  I was a heavy smoker - at least a pack a day."