Smoking is significantly associated with increased risk of COVID-19 and other respiratory infections.

Commun Biol · 2021 · PMC8553923 · PMID 34711921

Europe PMC DOI

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highly significantno p-value reported

They observed a highly significant association between smoking and several respiratory infections, including COVID-19 infection risk.

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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.