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The association between smoking and higher testosterone levels in men may be attributed to the competitive inhibition of androgen disposal by nicotine and its metabolites

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It is known to cause cancers starting in the mouth and traveling down to the throat, stomach, bladder, and rectum

The current evidence does not support smokeless tobacco as a substitute for cigarette smoking.

Specifically, studies have shown that e-cigarettes exacerbate airway inflammatory responses, elevate levels of type 2 inflammatory cytokines such as IL-4, IL-5, and IL-13, increase cellular oxidative stress, and impair lung function