You can do it! You are doing it the right way and for all the right reasons!
I don't have much advice since I haven't smoked, but I know it takes a lot of strength that you definitely have!!!
I also heard that smoking burns up to 300 calories per day for heavy smokers (!!!) and that is the reason for weight gain with many people (also the urge to have your mouth doing something). Just something to think about I suppose! I'm positive everything you are experiencing is totally normal.