I can't really help you much as I don't have any kids.

Maybe just let him know hey, I'm not stupid, I was 15 once, I know what you're up to. Hide your stash in a locked drawer to keep it safe.

When my dad caught me smoking reefer he said, "I can't give you shit for something I used to do. I don't mind if you smoke pot, but if I ever catch you smoking crack, I'm going to kick your ass"

I don't know, it might help. Sorry I can't help you out further. Good luck! :thumbsup: