It's not something you chose to do, but when things get awkward it's a device to shed nervousness. Now I do it when I think. Sometimes I just do it to make things even when incomplete jobs leave things frayed. Chewing the skin off of the inside of my cheek.
At what point in our evolutionary history, did humans develop a need for this skill? I'm sure that somehow it puts me above the rest of the gene pool for survivability. It'd be easier to quit smoking than to stop nibbling. And the best part? There always seems to be a little bit left to chew and tongue. There is this spot in the back of my mouth that is beyond the reach of my teeth no matter how I contort my face. It has taught me to be humble.
I submit this as a way to cheat those pesky DNA tests. If TV has served me right, they usually take the sample from swabbing your cheek. I chew so much, they'd be lucky to find a single helix.
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