The visualization shows data from an expert survey on different ways drugs harm people, published in The Lancet 2007. It splits the harm in three categories: Physical harm, social harm and dependency, each consisting of three sub-categories.
The lines represent the result for those nine sub-categories (ranging from 0 to 3), the strong arcs the mean for the main category. The thin arcs show the overall mean for all drugs. Hover over the elements to get the actual number.