Cannabis is the most widely used illegal drug in the world, with the predicted number of users exceeding 200 million people (UNODC, 2015). Within Europe, it is estimated that a quarter of the population aged between 15-64 years have tried cannabis, with nearly 7% indicating they have consumed it in the past year (EMCDDA, 2016). This frequency of use far surpasses the use of other illegal drugs: cocaine, the second most frequently used drug, is reported to have a lifetime use of 5.1%, with only 1.1% claiming to have consumed the drug in the past twelve months (EMCDDA, 2016).
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