Lucas Richert is George Urdang Chair in the History of Pharmacy at the University of Wisconsin-Madison. His many publications include Break on Through: Radical Psychiatry and the American Counterculture (MIT Press). James H. Mills is Professor of Modern History at the Centre for the Social History of Health and Healthcare (CSHHH) Glasgow, University of Strathclyde. His publications include Cannabis Nation: Control and Consumption in Britain, 1928-2008.