When people discuss the drug war, they are usually referring to the one that began in the 1970s, without realizing that this was, at least, our third drug war in the twentieth century. I found David F. Musto's The American Disease: Origins of Narcotic Control to be extremely helpful on the subject. It was depressing to see that drug wars, in this country, are almost never launched purely out of concern for public health. In almost every instance that Musto looks at there is some fear of an outsider--blacks and cocaine, Mexican Americans and marijuana, Chinese Americans and opium.