I understand where you are right now in feeling you don't know how to parent. When teenagers choose a path that you don't like you really find out how little control you have. There are some great advice articles on here on teenagers and drugs by cookclan as well as teenagers and depression by RadicalB plus many others on this site. I am coming into this difficult stage myself. Some may be lucky enough to breeze through it but I have found this age to be the hardest so far. I have 3 teenage boys myself so if you want to feel not so alone, feel free to visit my page and send me a message. I really hope that he wants to change and this is the wake up call he needs.