You're welcome, Xyzcf. You would like me to try to find a more complex model?
2 packs or more a day for 17 years?
Wow, that is a lot.
The reason I first pick a neuroscience course was not MLC, it was smoking/addiction. When my cousin who had MLC hit rock bottom, he stayed here. So did his brother. Cousin who was not in MLC and I spoke a lot at dinner and one of the things we spoke about was his smoking, the fact I never smoked - even if I had tried a few cigarettes in my teens, 15 at most in some 5 years. Cousin said I was lucky because my brain did not had a tendency to addiction. We keep talking about addiction, depression, etc. and I found it interesting enough to wanted to know more.
I had already heardd of Coursera, so I found the Drugs and the Brain course, the first one I took.
What cousin had explained to me was that cigarettes calmed him down. For him, as for his mother, my aunt, it was more relaxing related than pleasure. My aunt's boyfriend still smokes, about 4 cigarettes a day and now only outside. For him it is both the direct nicotice addiction as well as the gestures, being on the computer and pulling out a cigarette. Since he now has to get up and go outside, he cut from 10 to 4/3 a day and is trying to reach 2, then zero.
Aunt should had stop smoking after her cancer. She didn't. Only stopped early last year, after her stroke. She does not have the addiction since her mood suffered no change, it was just an habit (OK, an habit can be an addiction).
Sometimes good things fall apart so better things can fall together. (Marilyn Monroe)