Book Review Trippy: The Peril and Promise of Medicinal Psychedelics By Ernesto Londoño Celadon Books: 320 pages, $29.99 If you buy books linked on our site, The Times may earn a commission from Bookshop.org, whose fees support independent bookstores. Ernesto Londoño’s engrossing and unsettling new book, “Trippy: The Peril and Promise of Medicinal Psychedelics,” is part memoir, part work of …