I wrote a long piece on psychedelics for Current Affairs magazine diving into the history, economics, and potential political impact: https://www.currentaffairs.org/2019/04/make-america-trip-again. I don’t spend too much time on the research on psychedelic therapies (these are well covered elsewhere, particularly Michael Pollan’s book How to Change Your Mind). I also don’t take an explicitly EA approach to the piece, although I do identify with EA.
I do think that psychedelics are a massively under-explored EA topic for reasons that have been mentioned. Their ability to increase psychological openness would probably prime them for EA in addition to all the mental health benefits.
I started out in EA as an omnivore who cared primarily about global poverty/health. Over time, indirect exposure to more vegans/vegetarians and the good arguments in favor of helping animals. I became pescatarian in Jan 2018 and vegetarian about a year later. But if people had been in my face about it/made me feel unwelcome for being an omnivore at the beginning, it’s possible I wouldn’t have stuck around and gone veggie. It’s for this reason that I’m very careful about talking about the issue. It’s not that I don’t think we have a moral obligation to not consumer animal products, I’ve found that focusing on the “how” of going veg and only being candid about the moral considerations when pushed is most effective.