Smoking marijuana may be more harmful to lungs than smoking cigarettes, study finds

People who smoke marijuana were more likely to have certain types of lung damage than people who smoked cigarettes, according to a new study that reviewed lung scans of smokers. The researchers who led the study say their findings suggest smoking marijuana may be more harmful than people realize.

The Centers for Disease Control and Prevention estimates at least one-fifth of Americans have tried marijuana at least once. With more states legalizing the drug, it has become the most commonly used drug that is still illegal at a federal level.

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