Hallucinogens have been used for millennia. However, today their legality and health consequences have been matters of national and international debate.  Through objective overviews, primary sources, and full-color illustrations, this title examines What Are Hallucinogens? How Harmful Are Hallucinogens? How Serious a Problem Are Hallucinogens for Society? How Can Illegal Hallucinogens Be Controlled?