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Does marijuana cause lung cancer? Doctors call for more research

“There are respiratory effects to using smoked marijuana for long periods of time,” said Russell Bowler, director of the COPD clinic at National Jewish Health [and professor of medicine at the CU School of Medicine]. He's a member of the Retail Marijuana Public Health Advisory Committee for the Colorado Department of Public Health and Environment, which commissioned the study.

NBC News, April 13, 2019

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