Resources for understanding addiction:
http://teens.drugabuse.gov/drug-facts/brain-and-addiction This site has a bunch of down to earth information. There are many links within the site.
http://teens.drugabuse.gov/blog/post/addiction-disease This site offers a good way to start conversations about how we are conditioned and manipulated by events in our world.
http://learn.genetics.utah.edu/content/addiction/seeds/ takes a look at societal influences on addiction. Can be a good conversation starter to raise awareness of the world around us.