The non-medical use of prescription drugs is causing greater harm and accounting for growing numbers of drug-related deaths, according to the 2018 World Drug Report, released by the United Nations Office on Drugs and Crime (UNODC). The comprehensive report provides a global overview of the supply and demand of opiates, cocaine, cannabis, amphetamine-type stimulants and new psychoactive substances (NPS), as well as their impact on health. The site has a great feature where you can look at annual prevalence of drug use across the world. It is important to note that comparing drug use figures is problematic as countries have different laws, religious and social values and the way data is collected varies. Nevertheless, it’s an interesting read.