Smoking Weed Doesn't Harm Lungs If It's A Joint A Day, Even After 20 Years

Despite all the medical benefits marijuana has, doctors and scientists have long wondered whether smoking it damages the lungs. After all, if smoking cigarettes, or basically anything else, can damage the lungs, then the smoke from marijuana should as well. But according to a recent study from Emory University, that may not be the case.

In a cross-sectional analysis using data from two rounds of the National Health and Nutrition Examination Surveys (NHANES), researchers found that adults aged 18 to 59 who smoked one marijuana cigarette — aka joint — a day were still able to forcibly exhale the same volume of air in one second (known as forced expiratory volume, or FEV1) as someone who didn’t smoke marijuana. Measuring a person’s ability to exhale is called spirometry, and it’s the go-to method for diagnosing respiratory diseases, which impair lung function.

Marijuana users who smoked...

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