My first guess was that they were smoking non-tobacco. It just seemed to fit. Also, yeah, he may have been really tired from the weekend and getting up early on Monday and all, but that's also why it knocked him out so badly. I was Honor Roll, National Honor Society, all that good stuff, and got stoned practically every day, at school and after. My folks thought I was a "good kid" (which I was; I just liked to get stoned too).
None of the text was filtered for me, so I was confused when people started talking about the "banned" stuff. They in turn were confused because of the "banned" stuff. It's all so confusing.
ETA: I'm glad he's okay, though. Chalk it up as a learning experience for everyone involved.