The three winners of the 2012 EMCDDA scientific paper award • ‘Diminished gray matter in the hippocampus of cannabis users: possible protective effects of cannabidiol’, Dr Traute Demirakca, Dipl. Psych. (Germany). Published in Drug and alcohol dependence, 114 (2011) 242–245. • ‘Long-term effects of a community-based intervention: five-year follow-up of 'Clubs against Drugs'’,Dr Johanna Gripenberg, PhD (Sweden). Published in Addiction, 106, 1997–2004. • ‘The impact of needle and syringe provision and opiate substitution therapy on the incidence of hepatitis C virus in injecting drug users: pooling of UK evidence’, Dr Katy M.E. Turner, PhD (United Kingdom). Published in Addiction, 106, 1978–1988.