Cigarette smoke has been found to worsen influenza A infections by disrupting the natural balance of throat microbiota, suggesting a significant link between smoking and respiratory disease severity
Definitions and classifications We define a smoker as a person who smoked at least 100 cigarettes in a lifetime, a current smoker someone who still smoked at the time of investigation, and a former smoker someone who had stopped smoking for at least three months at the time of investigation 5

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