Robert Anton Wilson. All of his fiction references psychedelics.
The Historical Illuminatus Chronicles involve belladonna trips during the 1770s. The Masks of the Illuminati happen to involve some psychedlia during the 1920s...Schrodringers Cat and Illuminatus trilogy with Robert Shea both involve 1960s and 70's psychedlic fun.
Also Shaman, by Robert Shea.
The Invisibles by Grant Morrison.
Carlos Castaneda is an obvious one to include here...
Also James Curcio.
That's all I got for now.
"Whoever undertakes to set himself up as a judge of Truth and Knowledge is shipwrecked by the laughter of the gods." Albert Einstein
I appreciate your perspective.