Another former smoker here; I managed to quit in 2007 . . . and the best part for me was that I didn't gain any weight because of it!
While I did it cold turkey, I fully appreciate making small changes, as that's what's worked for me with my weight loss. You've already pulled off great success with your weight, so you'll be able to tackle this battle too.
Good luck to you! It sounds like you've already got a solid plan in motion.