Wow I thought I was the only person who did this. Biting cloth is a major stress reliever for me. Plus, it's essentially harmless, I mean you're not hurting anyone or breaking anything, but it does give you some sort of inexplicable high. I'm not sure whether it is or isn't adrenaline, but it has a very similar feeling to a rush of that nature. Sometimes I just clench my teeth together really hard but that doesn't give the same feeling. Biting something really hard also helps relieve my headaches, not sure what the correlation is there but it works.
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