We call these substances consciousness expanding agents, well now, if consciousness does not play a major part in the future history of our species, then what kind of a future history are we talking about? Are we going to become stupider? duller? more animal-like? I don't think so. Consciousness is our defining quality and it must be nourished, encouraged, catalyzed--never more so than now because we have a planet in peril. The entire evolutionary enterprise may rest on the kinds of decisions we make about how we order and carry out our priorities over the next 50 years.
We need all the help we can get, and these plants have always been there to render council and give advice to evolving human populations that would humbly and reverently seek their input.