Uruguay paved the way when it legalised cannabis in 2013. But it is the reform in Canada, a G7 member, that has done most to heighten international tension over cannabis’s legal status. Last year it fully legalised the drug. Part of its rationale was that a regulated legal trade would curb the black market and protect young people, who were buying it there. Canada’s change has caused fierce fights within the UN in Vienna, according to Martin Jelsma of the Transnational Institute, a think-tank. A possibility that intrigues international-policy wonks is for Canada and other law-breakers to form an “inter se” (between themselves) agreement, allowing them to modify existing drug-treaty provisions. For this to be an option, Canada will probably want to wait until the club of outlaws is bigger.