27 August 2012 Last updated at 16:53 ET
Young cannabis smokers run risk of lower IQ, report claims
Dominic Hughes
Health correspondent,
BBC News
Prof Terrie Moffitt, researcher: "Those who started using cannabis regularly when they were in secondary school had lost, on average, about eight IQ points"Continue reading the main story
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Young people who smoke cannabis for years run the risk of a significant and irreversible reduction in their IQ, research suggests.
link-
http://www.bbc.co.uk/news/health-19372456