January 2015 marks 100 years since drugs were first banned. Johann Hari set off on a three-year long, 20,000-mile journey to find out why they were criminalised, how this is causing a disaster today and what happens when you choose a radically different path. His discoveries are told entirely through the startling and moving stories of real people - from a transsexual crack dealer in Brooklyn, to a Hungarian Holocaust survivor who discovered the real causes of addiction. With endorsements from Elton John, Naomi Klein and Noam Chomsky, this book will change how we think about one of the most controversial issues of our time.