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biochemistry - How does a smoker's finger or mustache get yellowish by nicotine? - Biology Stack Exchange
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Chrissy Teigen Begged Twitter For Help With Her Stained Fingers - How To Remove Stains From Skin - Good Housekeeping
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Golden Memories and Silver Tears on X: "Nicotine stained fingers was a common sight in the 1970's https://t.co/R0IhaOY39H" / X
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