My daughter and I quit smoking almost 10 years ago, cold turkey, not because we were ready to quit but because we could not afford for both of us to continue smoking and neither of us wanted to be the one that kept smoking and tempting the other. We both enjoyed the act of smoking, and it did seem to help even out some of the stress and tension in our lives. We managed to battle through the cravings and temptations. There were many days when we deliberately stood downwind of smokers at bus stops just to get some of that second-hand smoke effect, but we managed not to cave.
Almost 4 years ago, after almost 6 years of not smoking, things were coming to a head. The stress and tension that we had been dealing with for years were still there, compounded by the fact that we were looking at moving our small family - me, my daughter and my grandson who has autism - across the country so that my daughter could complete her last year of Graduate School and become a Doctor of Audiology. I was practically begging my daughter to pick up some cigarettes for me, not realizing that she was having the same feelings. She had heard about ecigarettes somewhere. We researched and hemmed and hawed for a few months, while trying to put some money on the side for either cigarettes or ecigs. She finally caved, and got herself a Blu disposable just to see if vaping would possibly work for us. I had her get one for me, too. Neither of us has thought about smoking since that first day.
For us, I think it is a combination of nicotine dependence and the hand to mouth action that you get with smoking. My daughter is happy with her 18 mg nicotine and Evod setup. I have gone down to 12 mg nicotine with an Evod setup. At this point, neither of us is looking to change much. If I see credible research linking an "optimal" level of nicotine to ward off Alzheimer's, or at least keep it from progressing, I will go with that, since my Mom had Alzheimer's. I will also encourage my daughter to go with that "optimal" nicotine level. Unless and until that happens, we plan to continue to go with what feels right for us, and continue to be happy and content ex-smokers.