[USA] United States has highest level of illegal cocaine and cannabis use, and more / Eureka Alert, 30 June 2008
http://www.eurekalert.org/pub_releases/2008-06/plos-ush062608.php
Andrew Hyde
"A survey of 17 countries has found that despite its punitive drug policies the United States has the highest levels of illegal cocaine and cannabis use. The study, by Louisa Degenhardt (University of New South Wales, Sydney, Australia) and colleagues, is based on the World Health Organization's Composite International Diagnostic Interview (CIDI) and is published in this week's PLoS Medicine."
http://medicine.plosjournals.org/perlserv/?request=get-document&doi=10.1371/journal.pmed.0050141