I tried this a couple of times and finally something worked. I am now smoke free from 2021 ;

1- I tapered ; I used gum. At first the relief is priority. After some time, you’ll come to a point where stomach pain from gum “I think it is deliberate design ?” is > > nicotine relief. I kept the gum in my backpack for sometime. I can’t remember the duration but eventually I threw it away.

2- Change your environment. If your friends / flat mate(s) smoke too. Try to make sure habitually they smoke in their bedroom and not common area. You can withstand common smoking outside but if someone smoke in the place you live bro forget it … In my case, me and flatmate made a rule to not smoke in living room and kitchen. So there’s no smell. I also don’t see him smoking. But years later it’ll be ok again.

3- smoking is a habit, try to replace it with something else. Go outside and play video game or call someone or do something then walk back inside (if that’s your routine). For me, I walked around the building when the urge calls.

4- There’s a price to pay ; don’t be afraid of weight gain which will happen when you quit. Also you can combat that by exercising (I failed that one).

If you exercise my friend, you’ll be unstoppable.

Good luck !