Monolith

These symptoms suggested that our evolution, I suppose, from the animal kingdom into human kingdom itself was catalysed or triggered by our encounter with these hallucinogenics, and...

Yes, we are an ape with a symbiotic relationship to a mushroom, and that has given us self reflection, language, religion, and all the spectrum of effects that flow from these things

And one can only wonder how these hallucinogens might effect our future evolution as well

They have brought us to this point and as we make our relationship to them concious, we may be able to take control of our future evolutionary path