I had been a smoker for 50 years, and was smoking 40 a day. I had tried stop smoking drugs, but the problem was I wasn't trying just expecting the pills to work. It doesn't. Then I found out I had Barrettes Esophagus. If it develops there is a 20% chance of cancer. I did not like those odds. Doctor's recommendation change of life style. I still liked a couple of beers, so I looked at my smoking habits. I am retired and in the morning when I got up first thing I would do was smoke 4 cigs, then have a cup of tea. So I thought let me have a cup of tea first. It worked, I delayed my smoking my over an hour, then I had a second cup of tea before I smoked. Almost before I realised I was not lighting up until lunch time. My wife noticed, she stopped her five cigs a day about 4 years previously. and made a positive comment. Soon it was a day then, that was it. I didn't have any withdrawal symptoms.
I tried before maybe 25 years ago, and after 5 months of struggling, I had physically stopped but mentally just kept wanting to smoke, I cracked.
So all I can say it can be done, and I would never have believed anyone who said it was possible.