i don't really see it as a disease either. it's your choices; some people just get caught in an avalanche of them and can't stop them. maybe addiction is a behavioral disorder, but it's something you can kick on your own if you choose to.
you can't kick cancer by choice. you can fight it with medicine and procedure and everything else. being addicted is a symptom of behavioral choices and actions. make better choices, be honest, and liberate.