A recent study by Harvard Medical School provided further scientific backing that cannabis smoking poses fewer pulmonary risks than tobacco smoking and is unassociated with an increased risk of emphysema.

Tobacco smokers exhibited considerably more damage to their lungs, including a higher incidence of emphysema. Strikingly, the study found no positive correlation between exclusive marijuana smoking and the development of emphysema or pulmonary hyperinflation.

This adds to the growing body of scientific evidence indicating that the combustion byproducts of cannabis and tobacco have different impacts on the respiratory system.

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