You know what is weird? When I was with the depressed bf, I never found any support for 'friends and family' of a depressed person. The same codependent issues come up with people in those situations as do with addicts.
I finally went to a counselor and she said that he cannot help being depressed, but that he COULD decide whether or not to do something about it and that I should not feel guilty for breaking up with him. i guess the same logic applies to addicts.