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Sudden discoloration, dark spots, or uneven staining may signal an underlying issue

However, while a recent report indicated that e-cigarette vaping also caused nicotine-dependent ACE2 up-regulation [42], others have revealed that neither acute inhalation of e-cigarette vapour nor e-cigarette users had increased lung ACE2 expression regardless nicotine presence in the e-liquid [43, 110]

Floss once a day to clear plaque between teeth, where brown or yellow discoloration often forms

I smoke, but I would never give a teenager a cigarette

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