Since I have just been diagnosed with aggressive (aka missing C17 and P53) Chronic Lymphocytic Leukemia, which is a cancer that is exacerbated by respiratory illnesses, might I suggest you keep them and wear them whenever you are going out and are feeling "off", getting over being sick, or have allergy issues manifesting (so you can't tell if you're sick). For my kind of leukemia sufferer and other immuno-compromised folks, we'll be forever grateful

...if we all take this opportunity to actually keep up good habits (washing hands and staying home when sick), we'll help so many more folks even post Covid...