I want to provide you with a couple of analogies to help paint a picture of this problem from a diferent angle.
With smoking, the problem we have is that we are doing this many times a day. I am convinced that our body wants to desparately adapt to this change in order for us to feel less "empty" inside like something is missing.
Think about how many cigarettes you used to smoke per day on a regular basis. Now think about how may puffs it takes to smoke just "ONE" cigarette. Having trouble thinking about that number? dont because I have asked many people this same very question, and they have trouble thinking of a number too. the point is, we do this without even thinking about it. Lets just say it takes 10 puffs to smoke a cig. Multiply that by a pack a day, thats 200 times a day we bring something from our hand to our mouth. Here's the analogy: what else do you do 200 times a day???
Maybe we blink our eyes, or take a breathe 200 times a day. but we do not think about everytime we take a breathe or blink an eye do we? We can certainly control a breathe and we can force ourselves to blink on command, but we do these things without even thinking about it. With that logic it may be safe to assume that we smoke without even thinking about it. EXCEPT when we dont have it anymore. Our body wants to desparately replace this habit (ADAPT) and unfortunately what is the easiest, quickest way to replace this hand to mouth habit? FOOD. Just because you quit does not mean you have to go to food. If it is okay, I would like to give you a couple of ideas and I hope they help you. If you need more suggestions please let me know:
Stress ball - keeps those hands busy without totally giving into the hand and mouth
Water bottle - safely (calorie free) replace that hand to mouth habit.
Worry stone - another version of a stress ball, but you can rub this between your fingers,
Word puzzle - keep your hands and your brain distracted (knitting, reading works as well).
Keep trying, you will find a way to beat this, dont give up!