The annual European Drug Report published today said the agency identified more than 80 new chemical drugs last year, making a total of almost 250 detected over the past four years.
The new substances are not controlled under international law. They are widely sold as "legal highs," often over the Internet, and try to mimic the effects of controlled drugs such as cocaine or LSD.
While some are manufactured in clandestine European laboratories, they are more often imported from China and India.