Have you ever wondered why you have an addiction and your best friend seemed to be using or drinking as much as you at one point but they could stop and you couldn't? The New York Times had a great article on who falls to addiction and who gets by unscathed. Read more about this topic on the following link.
http://www.nytimes.com/2009/05/05/health/05brod.html?ref=alcoholabuse
