weed vs cigarettes lungs Imaging study: Marijuana smokers show higher rates of emphysema, airway diseases than tobacco smokers Health Risks of Secondhand Smoke
Health Risks of Secondhand Smoke and Aerosols Factsheet US EPA Vaping, smoking harm lung health Stevenson Villager Comprehensive characterization of mainstream marijuana and tobacco smoke Scientific Reports Emphysema, airway inflammation more common among marijuana than tobacco smokers
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