I heard an interesting counterploint the other day. I think the statement is completely unfounded but figured I'd share because it sounds reasonable...
"Memories are formed by neural pathways, and it is these memories / correlations that form a basis for (some) mental illness. Taking psychedelics can help take another perspective on these memories and rewrite these these pathways / correlations."
Wow this sheds some new light on an anecdotal experience if mine:
I once watched a climber free climb a moderate 30 meter route me and my friends had just completed with ropes, and he mentioned his LSD hallucination was peaking as he saw us at the top.
I considered that maybe climbers like him have exceptionally higher risk tolerance or a habituated comfort with psychedelics and climbing. However, as someone with a reasonable amount of exposure to both of those (separately), it still baffled me. This feels like a more palatable explanation in tandem with higher risk tolerances and habituation.