Apologies for what could well be a dumb suggestion: Herbal / nicotine free cigs exist. They might be an avenue of escape if you haven’t tried that already.

Smoking isn’t just the nicotine fix, it’s the whole ritual of getting away and doing something else for a while. Scratching that itch might work.

Of course there are other ways to get away and do something else for a while, but those are for later.