I confess that I have worn a mask inside my car. I had forgotten to remove it after leaving a site where a mask was required. It feels pretty stupid once you realise what you've done.
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"No friend ever served me, and no enemy ever wronged me, whom I have not repaid in full."
I wear a mask when woodturning and general sanding, often for hours on end. You get so used to them that it's easy to forget. I've greeted people at the front door while wearing a mask - pre-pandemic ! So it's no surprise to see solo car drivers wearing them.