Oh yeah, another thing in Apocalypse to note. They mention DMT in it, and in The Spirit Molecule several of the study subjects related experiences where they appeared in some place and were unexpected visitors. Mckenna also talks about how DMT is a primitive but effective form of technology that allows nonlocal communication (and even trans temporal) and that the things on the other end are real as anything in this world, part of some kind of natural cyberspace our ancient atlantean ancestors tapped into.

It's got me wanting to explore this space again in the future, when I have the opportunity to procure the materials.