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Health Impact Measurements Medical research uses cigarettes-per-day measurements and pack-year calculations to determine health risks and exposure studies that require precise consumption data

Considering the consequences Otis Brawley, chief medical officer of the American Cancer Society, says the study is easy to believe. The smaller particles in filtered cigarettes get past the bronchial tubes into the smaller tubes, called bronchioles, he said, explaining that this irritates the tissue in the periphery of the lung, where adenocarcinomas are found

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Smoking marijuana is increasingly common in the United States 14 , and understanding whether it causes lasting damage to lung function has important implications for public health messaging and medical use of marijuana 15,16