Moderate lifetime marijuana smoking not associated with lung function decline

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the ONA take:

According to a new study published online in the journal Annals of the American Thoracic Society, researchers at Emory University in Atlanta, Georgia, have found that moderate lifetime marijuana use is associated with airway inflammation, but not significant changes in lung function.

For the study, researchers analyzed data from the National Health and Nutrition Examination Survey (NHANES). They identified over 5,000 adult survey participants with data on recent marijuana use and respiratory symptoms. Results showed that nearly 60% reported using marijuana at least once during their lifetime, and about 12% said they had used marijuana in the last month.

Among the 3,000 adult participants who had patterns of lifetime marijuana use, cumulative exposure of less than 20 joint-years was not linked with significant changes in lung function; however, more than 20 joint-years of marijuana exposure was associated with clinically significant changes in lung function.

The results do not show whether this change in lung function represents early lung function decline like that of long-term tobacco use. Researchers also found that marijuana smoking increased respiratory irritation, but the study could not determine whether those symptoms were permanent.

The researchers note that they did not assess an association between marijuana use and cancer.

Long-term marijuana use may cause cancer
Moderate lifetime marijuana use is associated with airway inflammation, but not significant changes in lung function.
A research study based on analysis of publicly available data has found that recent marijuana use was associated with symptoms of airway inflammation, but that moderate lifetime use was not associated with clinically significant changes in measures of lung function.
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