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.