A new topic has been suggested by a reader:

‘Do Shamans in the East use hallucinogens?’

I’ll do some more research, but for the time being here is a good link about their use in Mongolia:

http://buryatmongol.org/a-course-in-mongolian-shamanism/the-shaman/drumming-hallucinogens-paths-to-ecstasy/

I’ll also explore Shamans’ use of hallucinogens in general.  A link:

http://anthro.palomar.edu/religion/table_of_hallucinogens.htm