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Cannabis linked to respiratory symptoms

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Long-term cannabis smoking leads to respiratory complications, a systematic review has concluded.

US researchers studied papers published from 1966 to 2005, which evaluated the effect of cannabis smoking on pulmonary function.

The review failed to show a link between long-term use of the drug and emphysema. But all 14 studies noted an association with increased respiratory symptoms, suggesting obstructive lung disease.

The authors said: ‘Clinicians should advise their patients of the potential negative impact of marijuana smoking on overall lung health.’

Archives of Internal Medicine (207) 167

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