smoking marijuana vs cigarettes may be more harmful to lungs than smoking cigarettes, study finds Smoking marijuana can raise risk
Smoking marijuana can raise risk of lung disease, chest scans indicate Does Marijuana Cause Lung Cancer? Keck Medicine of USC Will Big Tobacco Become Big Weed Joint Smoking of Marijuana and Cigarettes Ups Emphysema Risk Respiratory Therapy Don't smoke it with tobacco: scientists suggest ways to make cannabis safer Cannabis The Guardian
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