https://www.acsh.org/news/2021/06/08/does-smoking-prevent-covid-19-we-dont-know-some-journalists-dont-want-find-out-15588

https://www.nature.com/articles/s41533-021-00223-1

A number of recent studies have found low percentages of smokers among COVID-19 patients, causing scientists to conclude that smokers may be protected against SARS-CoV-2 infection.