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If you're a smoker and have ruled out other medical conditions and the possibility of a fungal infection, chances are good that your smoking habit is the cause of your yellow fingernails. That having been said, a smoker's finger nails will generally become yellow if he/she holds a cigarette downwards allowing the smoke to rise upwards towards the fingernails. Many people believe this yellowness is caused by nicotine in the smoke and it is even sometimes called 'nicotine staining'. However, this is a complete fallacy as nicotine, in its pure form, is a white, very poisonous, solid. The yellow color is actually due to staining by tar deposits in the smoke. In extreme cases the yellow color can turn to a darker brown as more tar is adsorbed onto the surface of the nail. Smokers need to be aware that staining like this not only happens to the nails and fingers - it also occurs mostly in the lungs, the lungs of a smoker being dirty brown rather than bright pink. It is the tar staining in the cigarette that can eventually lead to diseases of the lung such as emphysema and lung cancer.

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16y ago

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