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Open Accesshttps://doi.org/10.1136/thoraxjnl-2017-210722
Copy DOI Journal: Thorax |  Publication Date: Jan 11, 2018 |
 Citations: 103 |
Affiliation: University of Alabama at Birmingham, Johns Hopkins Medicine, Johns Hopkins University, National Jewish Health, University of Colorado Denver, Birmingham VA Medical Center, University of California, Los Angeles, Brigham and Women's Hospital, Pulmonary and Critical Care Associates, Harvard University, University of Nebraska Medical Center, AstraZeneca (United Kingdom), Morehouse School of MedicineBackgroundCigarette smoking is the strongest risk factor for COPD. Smoking burden is frequently measured in pack-years, but the relative contribution of cigarettes smoked per day versus duration towards the development...
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