Smokers are mostly immune because they inject loads of niacin in the form of nicotinic acid. Niacin helps prevent viral infections. FYI, all nicotinic acid in drugs and supplements comes from, you guessed it, tobacco. Why is there a war on tobacco?
I did not know any of the facts that you posted.
Not only “why is there a war on tobacco?” but also “Is this why Biden is demanding that the nicotine level in cigarettes be reduced?”