Mixing mushrooms and cannabis can lead to some seriously weird places, just read some reports on erowid.org. And Terrance did that repeatedly.

I did this once and ended up completely languageless for a moment, like unable to write and speak at all. Then I would have very intense visions so I would try to close my eyes but alas! my eyes have been closed this whole time. Then there were black holes eating up my field on vision, like clusters of dead pixels on a computer screen, spreading.

Also, I think Terrance suffered from a brain tumour which eventually killed him - I wonder if his migraines and experiences were influenced by that too.

And then there’s this quote from Leary, I think: “Hang up the phone once you got the message”. Psychedelics are no joke. I do advocate for them as sporadic psychological aide because they truly do loosen up the rigid structures in your mind and allow for a lasting change and improvement. But each session should be treated with utmost respect. There should be an understanding that each has the potential to be the best or the worst experience of your life.