A new drug is reported in Europe at a rate of about one every week.
The European Monitoring Centre for Drugs and Drug Addiction (EMCDDA) said some 50 new substances have already been detected this year.
A total of 49 new "psychoactive" substances were officially notified for the first time in 2011, the EMCDDA said, up from 41 in 2010, and 24 in 2009.
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