http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2928221/
Quite a bit of layperson terminology in the above link, and well over 150 citations to other articles pointing back to the general study of nicotine addiction. It might explain a few things to those that want to stop smoking, and outline some of the newer methods of cessation (through pharmaceutical pursuits and positive reinforcement -- aka cognitive behavioral therapy, the only part of psychology that is related to science at all.)
Also related, and interesting finds on "the patch" and gum:
http://www.theadminisaprick.appspot..../I-38.full.pdf