Yaeh, it made me subscribe to audible and listen it for free: https://www.audible.com/pd/Bios-Memoirs/How-to-Change-Your-M... I enjoyed the book, but the claim that quantum physics might suggest that matter can have mind (because of wave particle duality) kind of killed it for me. Also, I don't find opinions of proponents of https://en.wikipedia.org/wiki/Trepanning very relevant. But it's a nice overview of history of psychedelics and introduced me to some fascinating figures, e.g. https://en.wikipedia.org/wiki/Alfred_Matthew_Hubbard

N.b. Pollan presents his subjective experience. If you liked it, you will love reports on https://www.erowid.org/ and there's a lot of information on https://psychonautwiki.org/wiki/Main_Page if you decide for firsthand experience.