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While smoking side effects on the skin dont directly darken the skin, it can lead to a dull, greyish complexion and uneven skin tone, often referred to as smokers face. This effect is primarily due to the numerous harmful chemicals in cigarette smoke that damage collagen and elastin, crucial proteins for maintaining skin elasticity and brightness

This is because the tar in cigarette smoke (not the nicotine) causes the body to break down some substances more quickly than usual

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High SKIN melanin content, vitamin D deficiency and immunity: potential interference for severity OF COVID-19