I understand keeping Chantix around as a safety net. I got a refill of my prescription after the initial 90 days, because I told myself I would take a pill before I smoked. My logical brain realized that one pill would do virtually nothing, but it made me feel safer in my quit. However, I think if someone has been quit for some weeks or months, that popping on a patch or chewing nicotine gum is only going to make matters worse, because the physical addiction is done. I say this based on the law of addiction:
Administration of a drug to an addict will cause reestablishment of chemical dependence upon the addictive substance."
Now, is it better to do that than light a cigarette? Yes, but why awaken the addiction?