Not exactly an answer to your question, but some years ago (2010) this report was made in the UK about the Harm Caused By Drugs: http://media.economist.com/sit

Not exactly an answer to your question, but some years ago (2010) this report was made in the UK about the Harm Caused By Drugs: http://media.economist.com/sites/default/files/imagecache/original-size/20101106_WOC504_0.gif http://media.economist.com/sites/default/files/imagecache/or... Edit: here another chart showing the 'dependence' of tobacco is very high: http://medicalmarijuana.procon.org/files/1-medical-marijuana-images/ranking-20-drugs-and-alcohol-by-overall-harm.png http://medicalmarijuana.procon.org/files/1-medical-marijuana...