smoking cessation
"During the first week of taking Chantix, I smoked.  I did not notice any decrease in my desire to smoke but noticed a significant increase in my tiredness.  The beginning of the second week of Chantix, I quit smoking all together.  The tiredness was still there and after taking the pill I would have nausea for a short time.  It didn't matter if I had just eaten or not.  I also became moody, depressed, short-tempered and just generally felt down.  I stopped taking the pill today, which has been 2 1/2 weeks on the pill.  I'm hoping for no worsening of my mood and energy level."