Mike Jay, the UK’s foremost historian of psychoactive plants, joins us to talk about the deeply strange hallucinogen/drug/medicine/sacrament mescaline - a substance derived from the peyote cactus.

Whilst other psychedelic compounds are more popular - and much more in the news - Mike tells us why mescaline was actually the very first psychedelic.

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More about Mike's work

www.mikejay.net