I never have to this time in my life and i think will pass on it now.I am sure it would be a vivd experience.The yaqui Indians use Peyote instead.
The experiences to a great degree were written into a series of books written by Carlos Casteneda called The Foundation Trilogy.Those were written in the early 70's.He wrote another book in the early ninetys.I can't remember the Title right now but it had to do with Dreams and was really interesting to me.
It seems that the Yaqui Indians have known for a long time that there was more than one world and Universe.But again I think I will pass on that experience as well.