Thanks In Advance
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COVID-19 is only contagious because it self-replicates. Even if we accept for the sake of argument that it is possible for spike proteins to migrate from where they are created to your lungs, to be exhaled, to be inhaled by another person, each of those steps will by necessity have substantial losses. We know that the spike protein can't be that toxic, because that spike protein is a part of a virus with a ~1% mortality rate, so without the ability to replace those losses you're not going to have significant exposure even if any exposure exists.
"Is the shed protein dangerous" is a different question than "do they shed spike protein" which is what you answered "they do not" too. You're also assuming that the spike protein can't be more dangerous than a whole virus which may be true but not necessarily because nanoscale structures can be physically dangerous just because of their size and shape, and the spike protein is roughly the size of an asbestos fibril.