cigarette effects on stomach Man smoking cigarettes, illustration Smoking & Acid Reflux: Consequences
Description
Mice without the CHRNA2 gene showed no differences from the control group when researchers fed them a regular diet

Other contaminants and other factors (such as pre-existing lung disease) may also play a role

Mar Environ Res
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As we know, even secondhand smoke has long been linked to an increased risk of lung cancer, per the CDC
