I know my dad is addicted to drugs. I've seen them in his car. He and my mom are divorced and I don't think she knows about it. He used to be an alcoholic but he got help and he overcame that and i was proud of him, but it turns out he has kept this a secret for a long time. I rememver seeing cans snuff in his car since i was seven and i didn't know what it was. I want to help him except I don't know how. What should I do?