Hairshaft thickness

coolerking

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Random question, but is full shaft thickness genetic? I noticed one of my girlfriends hairs on my pillow along with what I thought was a shedded terminal hair of my own. The thickness of hers is almost double mine. This scared me to think my hair must surely be one thats been minaturized. I pulled a hair from the back of my head to compare and it's even slightly thinner than the one I know was from the top. Is it possible to have thinner hairs to begin with?
 
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