Psychoactive drug restrictions and prohibitions have typically followed a reactionary pattern. From tobacco to LSD, the introduction of novel drugs has prompted therapeutic experimentation. Officials showed little concern until these substances also became popular recreational intoxicants.
At first sight this looks like another of those increasingly common commodity books, some of which are intended to be global in scope, and which include studies of chocolate, sugar, cod, salt and many others (digestible or not!). As Riello points out, commodities are a good way to tell a global story since many of them have been traded throughout the world for centuries.