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Jean Krutmann and his colleagues defined this concept as all the external and internal factors, as well as their interactions, that affect an individual during his life and the bodys response to these factors that lead to the biological and clinical signs of skin aging 1

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Smoking Pack Years is a term that is used by doctors and medical professionals to determine your exposure to smoking cigarettes over your lifetime as is based on smoking 20 packs a day

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Smoking prematurely ages the skin by wearing away proteins that give the skin elasticity, depleting it of vitamin A and restricting blood flow