A number of States have already decriminalized pot, the only sensible thing to do. I certainly realize it has some ill effects on some people in some quantity but nothing like alcohol. The teen mind is not sufficiently developed to make intelligent decisions about "little things" like that. He will simply have to suffer the consequences but you need to try to take it in stride and support the kid but not the poor decision.

One friend of mine had six kids; In the sixties and seventies, they grew it between the corn. They dried it in the house and, being a long way up a dirt road, wee alert to any intruders long before arrival. The kids have all become more than acceptable members of society, including a graduate of MIT.

I'd tell you what my kid did at that age but he is still embarrassed by it, 30 years later.