But imagine the kind of self-selection you'd find on such a forum. Furthermore, it's been long known that cannabis use can trigger schizophrenia in those who were already genetically predisposed to such. Your observation and the OP are not news worthy, imo. Bad outcomes have also been observed when combined with immature brains.

But for healthy adults, countless have used cannabis for generations without experiencing harmful reactions.

This one's my favorite: https://thereitis.org/mr-x-by-carl-sagan/