Confession - I haven't any experience with smoking-cessation hynotherapy. I hope it goes OK. I've got to have a first time some time. I'm not charging them, I just want the experience.
I was talking to my brother and his missus yesterday. They both struggled to give up (several years ago). She eventually resorted to Zyban ('nicotinic inhibitor'). She said after a couple of weeks it just turned off her cravings. My bro used patches, full strength for six months.
I've been reading up a bit on the action of nicotine on the nervous system. Not that I am going to lecture them about that, but I want to understand the process that I'm working with.