Dennis McKenna is an ethnopharmacologist, author, and brother to well-known psychedelics proponent Terence McKenna. His new book "Ethnopharmacologic Search for Psychoactive Drugs: 50 Years of Research (1967-2017)" is available here: http://www.synergeticpress.com/shop/ethnopharmacologic-search-psychoactive-drugs-50-years-research/ Learn more about your ad choices. Visit podcastchoices.com/adchoices