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Cannabis 'damages teens' IQ'

The major study into the effect of long term and persistent cannabis use has found the drug permanently damages IQ, memory and attention span. The study shows the drug has a different and more damaging effect on teenagers than adults.

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Teenage cannabis smoking 'permanently damages IQ'

The particular dangers of smoking cannabis are highlighted in the study. Credit: Press Association

Teenagers who regularly smoke cannabis risk permanently damaging their intelligence, attention span and memory, according to one of the biggest reports into the impact of the long term impact of the drug.

Researchers from King's College London and Duke University in the United States followed the development of over 1,000 people from birth to the age of 38 and found that cannabis has a different and more damaging effect on young brains that on those of adults.

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