does cigarettes lower testosterone The Conflicting Evidence for Levels & Nicotine Smokings Impact on Testosterone Levels
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doi:10.2105/ajph.2008.144097

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Understanding how chemicals in smoke affect lip tissue, stimulating melanocytes, and reducing circulation is key to addressing the problem

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These findings show that the nicotine component reduces the metabolic activation of CYP2A13 to CSE

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