It's been forty years since Timothy Leary sat beside a swimming pool in Cuernavaca, Mexico, ingested several grams of the genus Stropharia cubensis, and experienced a dazzling display of visions that led him to herald the dawning of a New Age. And yet, from the counterculture movement of the 1960s, through the War on Drugs, to this very day, the world at large has viewed hallucinogens not as a gift but as a threat to society. In Hallucinogens, Charles Grob surveys recent writings from such important thinkers as Terence McKenna, Huston Smith, and Andrew Weil, illustrating that a reevaluation of the social worth of hallucinogens-used intelligently-is greatly in order.