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