What do scholarly historians think of Mckenna's account of human history aka the stoned ape theory?
As much of his work stretches into prehistory, it might be worthwhile to crosspost to r/askanthropolgy (is there an archaeology equivalent as well...?)
As /u/Orphic_Thrench suggested, this post will probably gain more traction in /r/AskAnthropology. Here's a collection of Stoned Ape related posts: