Abstract: AbstractUncertainties remain concerning the pathophysiology, epidemiology, and potential therapeutics for COVID‐19. Among unsettled controversies is whether tobacco smoking increases or protects from severe COVID‐19. Several epidemiological studies reported reduced COVID‐19 hospitalizations among smokers, while other studies reported the opposite trend. Some authors assumed that smokers have elevated airway expression of ACE2, the cell recognition site of the SARS‐Cov‐2 spike protein, but this suggestion remains unverified. We therefo...
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Topics: 
Immunology
Internal medicine