"Giving people cash in exchange for doing the right thing for their health is the latest trend. Mexico lead the way in paying people to look after their health with a system set up in 1997 called Opportunidades. [...] But does paying people to be healthy work? [...] This is a highly controversial scheme. Many people in the UK are uncomfortable with the idea that drug addicts should be paid to give up crack. Director of the National Addiction Centre, Professor John Strang, disagrees. When it comes to addiction, 'it's bordering on negligent not to be willing to do that'." (Quoted from video description)