Scientists studied almost 4,000 students in Canada.
Researchers looked at 3,826 students attending schools in the Greater Montreal area of Canada. Every year from grade seven to grade 11, the team asked the participants whether they used drugs including cannabis and alcohol. They also tested their memory, visual reasoning skills and inhibition levels.
Past studies have linked alcohol and cannabis to issues with learning, decision making and thinking, and lower grades in adolescents and adults, the authors said. Hamilton was surprised that the study showed the cognitive problems in young people using cannabis persisted for the follow-up period in the study. “This is counter to the findings of other recent studies which found there were few long term cognitive effects of using cannabis.”
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