In July 1920, when the first Dangerous Drugs Act was passed, the UK drug scene was limited to small groups of Soho night people smoking opium and sniffing coke, and some middle- and upper-class people (mainly women) around the country quietly getting private morphine prescriptions from their GP. Now, exactly 100 years on, we have hundreds of thousands of people using a whole smorgasbord of different drugs. How did that happen?

The nineteenth century saw scientific developments whose unintended consequences laid the foundations for the modern explosion of recreational and chronic drug use, which has in turn sparked a worldwide effort to stop it. At first encouraged by the commercial opportunities afforded by widespread ‘cures’ – many consisting of little more than heroin or cocaine – by the twentieth century a moral crusade had gathered force to curb this new social ill.

In truth, although the dangers of drug use were very real, the origins of the war against drugs stemmed from wider fears in society. In this new book, the culmination of a lifetime of research and writing on the topic, Harry Shapiro isolates the different elements behind the war on drugs to present an issue reaching boiling point. Using a range of interviews, documentation, private papers, government archives and studies from the Institute for the Study of Drug Dependence, Shapiro synthesises a tale of crime, money, politics and exploitation bigger than any country.