"Drug-related deaths, most of which are a consequence of heroin dependence, have declined since the early 1990s, from 350-400 per annum to 150-200 per annum in this decade. HIV infections related to injecting drug use have also declined. This may reflect a modest decline in injecting, as opposed to smoking or snorting, of heroin, a decline in needle sharing among users because of Syringe Exchange Programs and the lower population of heroin dependent users."
Peter Reuter and Domenic Schnoz. "Assessing Drug Problems and Policies in Switzerland, 1998-2007." Swiss Federal Office of Public Health. November 16, 2009.