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. 2020 Oct 15;195:110317. doi: 10.1016/j.envres.2020.110317

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Fig. 3 — Expression level of genes encoding ACE2 and proteases of SARS-CoV-2 S protein in lung biopsies from smokers and non-smokers. (A) Gene expression in lung biopsies from smokers compared to nonsmokers and former smokers. *, p < 0.05; ***, p < 1e-5 (vs non or former smokers). (B) Gene expression in bronchial epithelial cells exposed to smoke from a brand of regular cigarette (2R4F) and a brand of typical “light” cigarette. *, p < 0.05 (vs mock treated).