Addiction experts say standard units, similar to those used for alcohol, would help consumers know the level of drug they are taking and its effects

Standard units for grading the potency of cannabis – similar to those already used for alcohol – would result in significant improvements in the mental health of users, according to addiction experts.

Researchers from the Addiction and Mental Health Group at the University of Bath, working with staff from King’s College London, UCL and the Australian Catholic University in Melbourne, say more needs to be done to make people aware of the levels of THC – the main psychoactive component – in the cannabis they are consuming.

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