smoking half a cigarette Single Half-smoked Lies On Weathered Stock Photo 2666748321 Closeup of a person breaking

Archived from the original (PDF) on 13 December 2007

Importantly, there was substantial person-to person variation amongst smokers with some showing markedly different values from controls and others showing normal levels of many parameters measured, indicating the former may be at significantly higher risk of developing lung cancer

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doi: 10.2147/COPD 34 YousufAIbrahimWGreeningNJBrightlingCE

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We restricted the sample to current daily smokers, determined by the response to the question: Do you currently smoke?, among adults aged 18 years who also endorsed at least one current cigarette smoked per day, drawn from the sample adult file of the NHIS (n=24429)