I stopped smoking 20 years ago and it was the hardest thing I ever did still.
A pack and a half per day for me. One must have big motivation to quit.
I got so low that I picked up butts and got the shakes big time and had to give up and start again for at least a year till I stopped and prayfully stayed stopped.
What I had to do was stop coffee and stop alcohol and stretch out meals for hours because they made me want a cigarette.
I replaced coffee with cocoa then fruit juices then anything. After about 6 months of smoke free then I started some coffee again and slowly a beer or two but no more, and stretching out meals means keep eating snacks or eat slow and yes one gains a little weight but food is a powerful substitute for many things including smoking.
To stop smoking takes a very long time, like 10 years to feel comfortable at saying "I already quit" and mean it. Stopping cold is fine because eventually that is the only way but then comes the long days and long weeks and weekends and skipping smoke breaks at work and it takes time and a long time to quit smoking.
Now for me 20 years later stopping smoking was my strongest moment and afterwards I feel like I control myself and food taste better and my teeth are cleaner and I make any smoker step outside because the smoke will stink up any room or the whole house.
Plus in older years the smoking looked cool and tuff but today everyone faces the smoking question and that means most of the population, and especially the educated part of the population will look at any smoker with scorn and say in secret that smoker has no will power.