I've had some experience with addiction of another kind. I think it comes down to internal work - while simultaneously trying to change behavior, too - getting to the root reason of a given addiction, and working it out, because will power only lasts that long. That is based on my own experience anyway.
Hopefully you'll be able to shake off the cigs, but you also should have mercy on yourself in case of a relapse and just get back on the horse.
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