In a recent Comment Ben Sessa1 explained how the War on the Drugs worldwide has impeded development of psychiatric treatment with psychedelics such as LSD (lysergic acid diethylamide) and psilocybin (found in magic mushrooms). Prohibition also had negative outcomes for the millions of individuals who find it worthwhile to use psychedelics in various cultural settings outside of those in the clinic.
Krebs, T. S. (2015). Protecting the human rights of people who use psychedelics. The Lancet, 2(4), 294.295. http://dx.doi.org/10.1016/S2215-0366(15)00084-X