This is the book that I have mentioned a couple of times. Pollan is an excellent writer on food, psychedelics and now consciousness.
It's only out in hardback in the UK. You can buy it (Amazon-free) here.
Or listen, as I have been doing, to the author read it on Spotify.
This looks very interesting; I have just ordered a copy and I'm looking forward to reading it .
Thank you for the recommendation Alistair :) x