Addiction is a very tough thing to treat. The best prevention is to avoid addictions in the first place, but if you are suffering from addiction, there are resources for you to use.
-Substance Abuse and Mental Health Services Administration (SAMHSA) | 1-800-662-4357
-12-Steps Homepage (Includes list of groups
General tips for breaking addictions
-Remove accesories and decorations related to your addiction
-Remember how good it will be when you're free from addiction