>>21002311Nicotine is an antiparasitic. They don't like that. It also binds to the ACE2 receptors which stops the evil spike proteins getting a hold. There were a couple of papers early on where it was found the majority of people in hospital were non-smokers. Those papers got memoryholed pretty quick and replaced by snoped recounts of history.
https://www.newscientist.com/article/2138655-birds-use-cigarette-butts-for-chemical-warfare-against-ticks/