I don't smoke, but I have food addiction, so I know how hard it is to quit an addiction. I work in Pharmacy and I haven't seen anyone on chantix that has failed. Patients telling me they quit on chantix after being smoker for 30-35 years. I personally have not heard a single complain. Like all meds, chantix has some side effects, but not everyone experience those. Good luck to you all.