Hi. It’s a difficult situation to be in. Firstly I think it says a lot about you and the relationship between the two of you that he felt he could discuss it with you, this is really positive. Secondly, it’s something that a lot of young people try. If he’s talking to you about it he may have his own worries about it, peer pressure or health concerns. I would just discuss the facts, it’s illegal, not good for you etc. Personally I wouldn’t punish him as I don’t think it will be of benefit to either of you and he’ll just be less likely to tell you things in the future. It sounds like you’re doing a great job with him.