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BMJ. 2007 October 13; 335(7623): 746.
PMCID: PMC2018775
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Cannabis is bad for the airways

Cannabis smoking has a dose related deleterious effect on tests of airflow obstruction, large airways function, and hyperinflation. A study of 166 cannabis smokers (of whom 91 also smoked tobacco), 92 tobacco smokers, and 81 non-smokers found that one joint of cannabis has a similar effect on the airways as 2.5-5 cigarettes. However, in contrast with tobacco, cannabis was not found to predispose to emphysema, as judged by computed tomography of the lung.

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