The Theoretical Problems Do Not Materially Affect the Results of Our Meta-Analysis of Smoking and COVID-19 Disease Progression.

We based our analysis on the data in Table 2 of Kim et al. 3 which, as Yue et al. correctly note, implicitly assumes that the one patient without data on smoking was a nonsmoker. 2 They note that the paper by Kim et al. 3 only reported smoking status for 27 of the 28 hospitalized COVID-19 patients they studied, but did not report which patient did not have data on smoking status. [Extracted from the article]