Congrats on quitting Mindi! Keep it up!

and good job on trying to quit marje-anne! You have my support!
(non-smoker here, but) As for the withdrawal symptoms of Champix, my texts state to me that only "some people do experience withdrawal symptoms eg. cigarette cravings, insomnia". It does state that you can consider tapering/weaning the medication itself, however how to do this and what the best method is, is unknown." (Australian Medicines Handbook) I would perhaps raise this concern with your general practitioner and your local pharmacist to see if they have any methods devised to prevent any issues down the track!
Steve