Comment by reissbaker
19 hours ago
According to Wikipedia, the Yunnan mushrooms indeed have their hallucinogens broken down after cooking: https://en.wikipedia.org/wiki/Hallucinogenic_bolete_mushroom
Good guess!
Although, the local hospital records imply that hallucinations can last for days or even months, so uh, probably not a great idea to go looking for them...
My guess would be there is probably some contamination with something ergot-like going on. Long-lasting but maybe hard to detect because such a small amount is needed for effect that it's easy to miss.
According to a voluminous illustrated tome I acquired during my extended stay, Yunnan has at least seven species of native psilocybe. Like nearby areas along the Himalayas, cannabis and opium are endemic and widely utilized in traditional cultures of the area. Heroin processed in Myanmar became a problem in rural Yunnan the early 2000s and present-era government shut it down with a heavy-handed campaign around 15 years ago. These days it's probably trans-shipped more than locally consumed.