The war on cannabis seems to be slowly burning out. On June 12th Jamaica announced that it plans to decriminalise possession of small amounts of the drug. Several countries, including Mexico and Portugal, have already taken this step, and many others are considering it. A handful of other jurisdictions—so far only Uruguay and the states of Colorado and Washington—have taken a different approach, not decriminalising but instead legalising cannabis. Many people mistakenly use the terms “legalisation” and “decriminalisation” interchangeably. What is the difference?