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Responding to questions of some researchers I can state the following:

COVID-19 seems to attack the oxygen depots in our body and in the first line, the erythrocytes! Also, the virus accumulates mostly in the brain and spinal cord – the organs most demanding and depending on oxygen. And finally, there are millions of healthy smokers out there (I mean without any chronic diseases). They will not likely get sick by COVID-19 or will not even notice it!

Please look at my idea in this angle. Good luck!