So Chantix has a list of side effects a mile long and comes with some serious warnings, and for good reason. I found myself obsessing about things that bothered me to the point where I would wake up and couldn’t get back to sleep because of mean thoughts running through my head. Not disturbing or anything, just focusing on things that make you mad. It caused some serious sleep issues, falling asleep in the day, not sleeping at night. I of course stopped the medication after about three weeks after check with my doctor. To those that follow me in taking it, I would recommend trying to get off of it after two weeks, the first week you’re smoking as it builds up in your system, the second week it’s fighting the urges for you, week three if you absolutely need it but I found it plays so much with your head you really don’t have time to think about smoking. You should be close to back to normal in about 3 days with the drug completely out of your system in 6.