cigarette smoke and asthma Smoking Asthma: What To Know The Number One Thing You

doi:10.1378/chest.128.3.1201 393

20 pack-years equals smoking one pack of cigarettes a day for 20 years or two packs of cigarettes a day for 10 years

however, they offer an opportunity for expanding our understanding of smoking behavior and lung cancer risk and may lead to new approaches to address ethnic/racial disparities in smoking and the risk of lung cancer

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