EN: Just a short notice. David Nutt et al. published an article  in The Lancet with a wholistic view on the danger of drugs including physical harm, addiction potential, and social effects. Bottom line is that some legally available substances like alcohol and tabaco are more dangerous than illegal ones like cannabis, LSD, ecstasy, if you use the proposed scale for ranking.
 Development of a rational scale to assess the harm of drugs of potential misuse, David Nutt, Leslie A King, William Saulsbury, Colin Blakemore, The Lancet, 2007; 369:1047-1053