Congrats on quitting smoking! And, it is amazing that you are able to diet and quit at the same time. I was too weak to attempt that. It is going on 11 years quitting for me. And, yes, I did gain weight afterward. But, having almost a lifelong habit and being old--trust me on this!---I decided one thing at a time, and took the most important road of my two vices or habits, or whatever you call them. I have lost weight in the 11 years since, but regained and lost it a couple of times. It is called clinical depression which is now stabilized and almost absent.
So, finally everything has fallen into place for me! I am now a happy and proud camper because I am finally accomplishing two lifetime goals, that, at my age, I am strong enough to maintain for the rest of my life.
I wish you continued success in continuing to be smoke-free and in reaching your weight loss goals. Don't be like I was, focus on your health and it will be a 'slam-dunk' for you. God bless and much success!