I was with a person who had smoked some of that crap once. They were delusional and scared and I almost took them to the ER. It was scary. Luckily for my friend, it wore-off. Right before it wore-off, they ate everything in my refrigerator, including two large chicken pot pies, (the big ones not the little ones).
While they were freaking-out, they said that they thought that their teeth were crumbling.
Sorry to hear about what happened to someone's son. I hope that he has a full recovery.