Greg, as a former smoker let me give you my 2cents worth. If you REALLY want to quit you will. If you're on the edge you won't. Part of it is that you have formed a physical habit (I don't mean the need for nicotine) but a physical movement habit as it relates to the act of smoking a cigarette. Remember for one, before you started smoking, when you were younger, you did not need to smoke. You got along fine everyday without one. You didn't ned it then, you don't need it now. Your brain says "what will I do with that time that I use when I smoke? I can't fill that time! I need something to do. The key is to change your habits that you have when you smoke. If you run to have a smoke everytime the last order comes in, force yourself to do something else with that time. I discovered that when I drove home, everytime I reached a certain exit on the highway I lit up the last smoke for the ride. So I started to take a different route. Once you can break those little physical habits it gets easier. Keep reminding yourself of when you didn't smoke and how you got along without it. Do this for 2-3 weeks and really want to and try and you will be able to break (and here are the key words) THE HABIT
Good luck