Speaker, I disagree the common issue is hypocrisy. That usually leads to trauma.
W.O.W. regarding the girls, what can you say? It was expected and it is normal. It is more normal for sixteen year old boys to be hanging out with girls than for them to be taking drugs. I mentioned before that you need to be prepared and be one step ahead. These things should not shock you. Your reaction should have been “I’m glad you told me” which of course opens the line of communications. He should be able to talk to you about all the changes that is happening to him.