Drugs like cannabis I thought were more likely to bring forward symptoms that were underlying already, as opposed to just causing it from scratch. So chances are it might have happened anyway, but weed just brought it out. There's so mcuh contradicting research on the matter.
The ripping off of book covers are more than likely to make a roach, which kind of acts like a filter, but more so used to structure a joint and give you somewhere to hold onto, it doesn't filter any of the crap out of the smoke.
I'm sorry you've been put in this situation, and I hope he gets the medical attention he needs to get better. Take care x
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