Should I say this to his friends?URGENT?

I would not get involved with his friends through this letter if I were you. Sounds like a lot of drama and you seem to already have your plate full. This is an issue between you and your bf not you and his friends. You are not in a relationship with his friends. You are in a relationship with him. Communicate with him. You have every right to say what is ok with you and what isn't. He has every right to do whatever he wants regardless. If pot (or any drug) is over the line for you, tell him that either he quits or you are leaving, or at the very least not being around him while he is stoned. He is in a relationship with you and he should respect your wishes and if they are not in agreement with his own wants and needs then you both need to evaluate the relationship. You are getting distracted by his friends ITS NOT ABOUT THEM. Its about you and him. Focus on that and leave them alone. You are only going to make enemies of his friends and make him defensive by attacking them and in turn him.