Aye, I agree with Bubbsie, give vaping another go. Don’t go for fruity flavours or anything fancy, stick to tobacco flavours, at least 1.8%. Then progress down through the strengths. There’s no rush, because it won’t kill you, and there are no side effects. And it assuages the comfort of sticking something in you mouth. The ritual. Nothing else does that.
I wouldn’t touch Champix with a bargepole, you’ve got enough on your plate at the moment without drugs addling your brain and body, and if you lapse while on it you’ll feel bloody awful. That’s if you don’t feel awful anyway.