Tobacco smoke exposure and altered nasal responses to live attenuated influenza virus.

Environ Health Perspect · 2011 · PMC3018504 · PMID 20920950

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may be significantno p-value reported

The interactions between air pollutants and respiratory virus infections are complex and may be significant for the health of both normal and diseased populations.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.