Interesting review of what is known about the Novel Psychoactive Substances flooding the market:
Matthias E. Liechti said:In the European Union (EU), 41 novel psychoactive substances were identified for the first time in 2010, 49 in 2011, 73 in 2012, 81 in 2013, and 37 by April 2014 within the European Early Warning System [2]. By 2014, more than 300 novel substances have been detected since 2005. Currently, more than one new substance is identified in one of the EU countries every week.