I took Chantix when I quit. BUT, I only took it for about 2 wks b/c I had the most horrific nightmares and weird dreams I have ever had in my life. The worst part was how REAL they seemed, woke up several times crying because I thought they were true. On the other hand, I have had other people tell me they had no problems with it. Needless to say, I had been quit for 2yrs 10mths, started back again last Tuesday, due to my current situation. And I do plan on quitting again as soon as I get get a hold of my senses.