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Smoking and Gray Hair

Q: How does smoking cause gray hair? I'm doing a project at school about environmental causes of graying hair.
 
no smoking sign A: Well, technically, there is no research to prove that smoking causes gray hair directly. What is known through studies is that smoking can contribute to premature aging. If an individual is predisposed to develop gray hair as he or she ages (or to lose the hair) then smoking can contribute to that development because it contributes to premature aging.
 
      Gray hair is formed when the melanocytes in the hair follicles stop producing melanin (pigment). The cessation of melanin production is usually triggered by hereditary encoding as we age, but there is evidence that shows that prolonged illness, periods of stress, and some medical interactions can cause the melanocytes to stop producing prematurely.
 
      As smoking does add stress to the body (chemical dependency is always stressful to the body) and since smoking is known to contribute to premature aging, smoking can be indirectly responsible for causing gray hair.
 
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Going gray
 
Why and how hair turns gray
 
Is smoking bad for your hair?
 
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