Tuesday 28 August 2012

AUDIO: Heavy cannabis users 'fall behind'

AUDIO: Heavy cannabis users 'fall behind': Using cannabis as a teenager can cause a permanent and irreversible drop in IQ according to a study of 1,000 people in the New Zealand town of Dunedin. Professor Terrie Moffitt, from the Institute of Psychiatry at Kings College London, gives his analysis of the findings. BBC News

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