I think you need to cut your self a bit more of a break.

Your trying to do 2 massive changes in your life at once. Quit smoking and trying to follow a diet at the same time ??

It almost sets most people up to just fail.

Maybe focus on the smoking bit and ease up on the diet a bit. I worry your going to just burn yourself out and then feel even worse about yourself.

Maybe just cut out fast food , or obvious carbs like bread and pasta... something that you can achieve easier, and once your down the road smoke free you can then focus harder on a diet.

Just a thought