I don't smoke, never have; but I have friends who have quit. From what I can see, different people find success with different approaches. What worked for one hasn't for another, like cold turkey. It worked for my best fishing friend, but he has a very strong will.
Another friend couldn't quit until he went to a hypnotist!
After three office visits he was done smoking.
That was 30 yrs. ago, and he still is his usual self- didn't start seeing ghosts, or coming to work in a dress!
Those new electronic cigarettes work for some people too.
Keep at it Steve! You'll find what will work best for you.