France, June 12 -- France's illicit drug market is becoming increasingly unpredictable, with users unknowingly ingesting substances that are not what they thought, according to a report released by the French Monitoring Centre for Drugs and Drug Addiction (OFDT).

The report is based on data collected through the National Identification System for Drugs and Substances (SINTES), which collects samples from drug users, to track the composition of drugs, particularly when they provoke "unusual and undesirable effects".

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