I recently purchased this book. It was great except for one thing. Hancock totally ignores Western Tradition. We also have Shamans, mainly Celtic ones like John Matthews who does not rely on drugs. Also it is surprising that Hancock's visions were the same as the ones of his hosts. Normally it is impossible to access the otherworld of another tradition. He should have seen the symbols of Celtic/Norse tradition. He also ignores the fact that modern that modern day Wiccans still work with the Sidhe (fairy folk). They have not just turned into grey aliens. He would be advised to read 'The Song of Taliesin' and read the chapters 'Journey to the Summer Stars' and 'Defence of the Chair' then see if he comes to the same conclusions.