"In an interview with the France Info radio station, Delfraissy said that the vast majority of COVID-19 patients in critical condition are non-smokers.
The immunology doctor suggested the nicotine in tobacco may be a form of protection against the virus."
https://www.moroccoworldnews.com/2020/04/299012/french-doctor-suggests-smoking-may-protect-against-covid-19-infection/