well, with any luck, this article will get featured or something... very well written, and very insightful.
I don't really have anything to add, but I will say that I agree with all that you had to say. I've been around addictions my whole life, from my sister being in AA when I was a teenager, to my Dad and my brother both being hopelessly addicted to computer games, even now.
I too have struggled with addictions in my day, from computer games to card games. I never started smoking because I know that I'm predisposed to getting addicted to things.
My response to Gerry Atrick's comment is this. People who's lives are shitty are gonna be more likely to seek out solace in some form of escape. Genetic pre-disposition? Sure. But some of it is environmental.
Define 'shitty'. Because I've known some pretty high end junkies and alcoholics.