I was listening to my local NPR station (KUOW) and there was an interview with Dr. Gabor Mate, who treats addicts in Vancouver, Canada.
He spoke of the Buddhist concept of the Hungry Ghost as a paradigm to illustrate our constant striving to fulfill our desires. He made some interesting medical links to being addicted to consuming– that we get addicted to endorphins, dopamine, and other brain chemistry as a result of our habits. He did make the distinction that addiction is any repetitive behavior that has negative outcomes– could be extreme sports, workaholic, or in his case, collecting classical music CD's. See http://www.drgabormate.com/ghosts.php
I've often thought that shopping panders to our origins as hunter-gatherers, that finding just the right piece of gear tickles the same parts of our brains that looked for just the right piece of flint, ripe berries, or game. To stretch this hypothesis a bit more, I guess that those of us who succeeded on the evolutionary scale were good at finding the good stuff and storing it away for the lean times. The problem comes when those skills run up against the efficiency of modern technology– limitless food, gadgets, and amusements. Much too easy to end up fat and with advanced TMS— Too Much Stuff!
It's not all about addictive behavior– we do have social conventions and are taught by others with erroneous assumptions, etc. It takes a brave soul ignore what a Scout leader has said, or blow off advertising that convinces us that more is better. Simple fear can get us to hoard or pack more gear than we really need. It's all about seeing in new ways.