Cannabis potency has doubled across Europe in the past decade, according to the first study to track changes in the drug across the continent.

The study, published on Sunday in the journal Addiction and conducted by researchers from the University of Bath and King’s College London, finds that both cannabis resin and herbal cannabis have increased in strength and price with potentially harmful consequences for users.

In the UK alone, THC levels in herbal cannabis remained roughly similar between 2006 and 2016, however police seizures suggest they have risen sharply in cannabis resin.

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