I quit smoking for 2 years but recently started back up. I feel that once you become addicted your pretty much addicted for life. It's all about retraining your mind to quit. I feel that I'm going to quit again I just ran into a stressful time in my life and fell for the trap.
Contrary to popular belief cigs don't calm you down. They actually make you feel worse. I think if you look at smoking therd is a bit link between nicotine and depression. Of course they won't research it and it might be just my experience.
I think your experience is spot on. It comes with what I have felt and know.
They mate you feel bad and your brain less to you and tells you another one will make you feel good. Nasty damn things