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However, the mental and emotional effects of nicotine withdrawal, including anxiety and mood changes, can persist for several months and may require medical support, especially for those with pre-existing mental health conditions

3 / 17 Black Hairy Tongue This painless condition occurs when the little bumps on your tongue grow long and trap bacteria that live in your mouth -- making the tongue look black and hairy

The bacteria and yeasts overgrow and make porphyrins (deeply colored organic compounds), which can contribute to discoloration [5]

device, nicotine strength, and puff length will change from person to person

Am J Public Health, 2016