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Updates every hour. Last Updated: 25-Oct-2026 11:16 ET (25-Oct-2026 15:16 GMT/UTC)
A major global analysis led by the University of Bath in the UK finds policy reform that removes criminal penalties for cannabis possession, or introduces tightly controlled legalisation, is not associated with increased levels of use. However, legalisation that allows cannabis to be sold for profit is followed by increases in use, addiction and psychiatric hospital admissions.
A teen’s mental health, as well as their body mass index (BMI) and screen time, are significantly associated with their sleep quality, according to a new paper published June 10, 2026 in the open access journal PLOS One by Jianying Li of Shanxi University, China, and colleagues. The study also found that girls and adolescents living in more rural areas tend to have lower sleep quality.