I really want to quit smoking and I have tried all the over the counter products to quit with no luck. I have recently started taking Chantix and I have noticed a decrease in the urge to smoke but I have also noticed an increase in gas and nausea. All the side effects of this pill are the symptoms of my IBS. I have been having a bad flare up for about a week before I started taking the Chantix so it is really hard to say if it is my IBS or the pills at this point. Has anyone tried Chantix? I really don't want to stop taking it because I have noticed a difference in smoking but I hate being sick all the time. Any advice?