Apparently the 1910's/20's was just about the time the facemask was first introduced. So I imagine it must've been a very "new and relevant issue" at the time, probably to help fend off Tuberculosis and other such diseases. https://pmc.ncbi.nlm.nih.gov/articles/PMC7309199/
In 1918? It was 100% because of the Spanish Flu. It didn't originate in Spain, but Spain was the only one covering it honestly because of the war going on. But some people were still patriotic enough to take on a minor inconvenience to help both themselves and others.
Everett true was basically the original, “see, I drew you as the soyjack and me as the Chad” but its, “See, I drew myself beating the ever living shit out of your stupid brain empty ass”
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https://pmc.ncbi.nlm.nih.gov/articles/PMC7309199/
Right back where we fucking started.