Hi Jeff,
I don't smoke - any more - because I too stopped many, many years ago, and here is the way I managed to do it.
To say that I had a habit is very true. Once, at work, I left my desk to go for a cigarette and a colleague quiped that it must be 11:00. HUH? Their answer was that, every day like clockwork I went for a cigarette at 11:00, and you know what - it was true. Habit, like clockwork, 11:00 am, cigarette, every day.
So, after thinking about stopping for what seemed like years, I woke up up one morning with a mouth that tasted like dry, singed rubber and decided to stop. The 'trick' that I used was that I changed my mind - literally.
I told myself that I was not a 'smoker who was going to stop smoking' (because you keep telling yourself that you are actually still a smoker who has just stopped), but that I was a
non-smoker, and that my body (ie those addiction feelings and unconcious habits) simply needed some time to catch up. Every time I felt like a cigarette I would tell myself that I was a non-smoker and that this feeling was an old habit that no longer applied to me. That was about 25 years ago.
Since then I have smoked half a cigarette. The first two weeks were the hurdle that had to be gotten over (it's Grand National week :smilie

, and I was still telling myself years later that I was a non-smoker, as those ingrained habits take years to die away. I always told anyone that 'I don't smoke', never that 'I have stopped'.
So I hope my story can help you in your efforts. I have lost a brother to lung cancer, and the father of a friend has just this week been started on Chemo for his lung cancer, so it is a subject that affects me closely on a daily basis.