This says low-calorie ‘finger-food’ to keep busy with, might help.
Weight gain after quitting smoking: What to do: MedlinePlus Medical Encyclopedia
Many people gain weight when they quit smoking cigarettes. On average, people gain 5 to 10 pounds (2.25 to 4.5 kilograms) in the months after they give up smoking.
Sounds weird, but we tried eating just washed and salted cabbage pieces from a bowl to see if we actually care about what we snack while watching movies. Didn’t really make a difference for us lol