Congratulations on giving up tobacco. I, too, smoked for 20 years then gave 'em up cold turkey (no pun intended). That was almost 40 years ago that I quit, but I remember how difficult it was. My advice is to just hang in there. After 2 weeks the cravings diminish significantly but will resurface at times you used to enjoy a smoke. When that happens, remind yourself that if you smoke just one, you will be smoking a pack a day - or more - in a week. All you have to do is not smoke that 'one.'
As for the turkey, it sounds like you've got a plan. It it was me, I'd use my Maverick 733 to monitor the IT of the bird for the first 4 hours. If it didn't pass the 40 to 140 in 4 test, I wouldn't eat it.
One think I used to do when smoking birds was to put some brown sugar in a cup/tray of aluminum foil and place it near enough to the coals that it would heat up and smoke. Gives a nice sweet taste to the turkey and darkens its color.
Good Luck! (Knowing that you don't need it for the turkey but might for dropping the tobacco habit.)