What Causes Halitosis (Bad Breath)?
Tobacco

Tobacco use, particularly cigarette smoking, can cause chronic ‘smoker’s breath,’ which is a foul odor on the breath that smells of the tobacco and chemicals from the cigarettes the individual was smoking. Although the smell is quite unpleasant, the long-term effects of smoker’s breath are much worse than just the smell. Research has found the chemicals and compounds released from smoking, particularly when individuals smoke a lot, can lead to dry mouth and a reduction in the salivary flow, and as many will be able to guess, can lead to a buildup of bad bacteria, resulting in prolonged bad breath.
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