smoking cessation
"Was on Chantix for about two weeks.  I did not take the PM dose or I would never sleep.  I did slow down and almost stopped within that time, but found I was irritable, cranky, and VERY depressed.  The side effects were mostly emotional.  I had to stop taking Chantix.  When you wake up in the morning feeling like it was the night before and the "sun" is not shining = entering deep depression, it is time to quit the medication."