Dont beat yourself up. You didnt do anything wrong. You said it correctly with atleast you didnt find drugs....
Maybe it is boys being boys. Who knows. I think its the addict thinking that gets them into these situations and he wont learn the difference until he is in treatment.
And I think in any situation especially with our kids, we give them an inch and they take a mile.
I am with outtolunch what is done is done. Again, I am thankful it wasnt drugs. I think for a 16 year old boy this is "normal behavior".
Good luck Winnie let us know about his progress in treatment....