The naive model of how people work seems to be something like "People are just messes of conditioning that respond to outside pressures and innate drives". You see people getting chemically rewarded for smoking cigarettes, and say "no wonder people get addicted - how do people ever stop!?". You find out that hypnosis can covertly condition responses and try to come up with clever schemes to maximize your effect - perhaps by having a meta level suggestion that the object level suggestion is reinforced every time some common thing is encountered. I remember devising a few clever schemes myself. However, this frame is entirely wrong. It completely neglects the internal structure - that thing that washes all your clever schemes out over time. The right way to help a smoker is not to implant a suggestion that makes them vomit every time they smoke - and then a suggestion that that suggestion and this one are permanent. The right way to help a smoker - the right way to help anyone is to... well...