The world is witnessing an alarming new drug problem - and much of the drugs are legal. Marketed as "legal highs", "research chemicals", "plant food" and "bath salts," new psychoactive substances (NPS) are proliferating at an unprecedented rate and posing significant public health challenges. The total number of such substances, already estimated to be in the hundreds, is growing steadily. Mixtures of NPS bought unknowingly by users have resulted in unpredictable and sometimes disastrous effects.

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