Smoking
I know this is off topic but I am probably the only IT smoker left in the UK and so I think my logic and experience is worth consideration.
Chinese statisticians found smokers were less likely to catch Covid and more likely to die of it. French scientists reckoned the only protective component must be nicotine so they are testing nicotine patches as a preventative measure.
I think the real protective effect is probably the smoker's cough. During a pandemic characterised by a hacking cough my normal smoker's cough keeps everyone else at a safe distance. Covid seemingly often presents a dry cough, mine is the normal phlegm one I've had for years, but nobody else knows that so people give me a wide berth. That gives me some protection from the seemingly healthy asymptomatic carriers.
300,000 British smokers have quit smoking recently which is welcome but weird - cancer, bronchitis, pleurisy and heart disease weren't as scary as Covid‽ My main worry is my normal cough would mask a dry cough. It's the first time I've found phlegm reassuring.
ETA: I've recently wore a surgical face mask for the first time, and started making them too. This terrified the public around me more than my smoker's cough! I highly recommend facemasks over smoking, partly because it hides the two teeth I've had to remove since my dentist disappeared.