Son – Lack of Trust part 2

Ok, I get that my thoughts are causing me to freak out. I also am learning to be open to the new thought that he is a teenager and is who he is. However, where does that leave me as a parent? How do I set rules/boundaries around marijuana usage? Is that a manual? I guess I’m not getting how to let him be who he is and not control him, yet still set guidelines as a parent where there are consequences for actions.