Parenting Teenagers (12-18) Support Group
This community is focused on the joys, challenges and concerns faced by parents of teenagers (12 to 18 year olds). The major areas of child development include: physical development, perception and sensory development, communication and language development, cognitive development, emotional development and social development.

I know from personal experience that these kids WILL use pot and DO self medicate. But it does not stop at pot and that's the biggest problem. I also believe these kids are more susceptible to become addicted, because of the self medicating effects.
You really have a tough road ahead, but know you are not alone and what you do right now could save your son in the long run.
My thoughts and prayers are with you.
I would also try to monopolize his time away from school with family things, fun things (sports and fun outings) and household jobs. A busy kid is a kid less prone to trouble.
All the best!
I think back to when I was a teen, I was a terrible teen. I tried all kinds of drugs and was sleeping around starting at 14. I was mouthy and disrespectful. I did what I wanted to do whenever I wanted. I was probably one of the worst kinds of teens. But, my mom had this friend and she was young and bold and fresh out of the army. She had her own family and I liked to spend time with them when I was allowed. This woman would punch me on the arm really hard every time I saw her. Really hard! Bruised me...I loved her. She didn't put up with my garbage and I thought she was real with me and cared. So I try to be like that with the kids at school, minus the punching. Just real and blunt. Anyway, don't know where I was going with all that, it's just like a big puzzle and as moms we are trying to put it all together and get some kind of masterpiece out of it in the end. (I'm a single mom, do dads worry like this about their kids?...cuz this seems a little one sided.)