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Impact of Tobacco Smoking on the Risk of COVID-19: A Large Scale Retrospective Cohort Study - PubMed
(1) Recent epidemiologic data suggest a paradoxical link between smoking and COVID-19. (2) Among the 1688 crewmembers (with an attack rate of 76% and exposed at the same time in the same place to SARS-CoV2), we found a significantly lower risk for developing COVID-19 in current smokers (71%)...
pubmed.ncbi.nlm.nih.gov
I think in France they were doing a study to see if nicotine is the reason for the lower risk.