On smoking nicotine enters into the blood & acts as chemical stimulator to accelerate the process of melanin deposition in skin.This increased quantity of melanin imparts a greyish black hue to the skin.Skin, teeth, gums, nails, lungs get stained too but facial region being more sensitive, the effect is prominent.
THE DAMAGE RENDERED TO THE SKIN DOESN'T REVERT EVEN AFTER QUITTING SMOKING !!!
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