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A 2016 meta analysis evaluating the impact of cigarette smoking on semen quality demonstrated a clear negative effect of tobacco exposure on male fertility. Synthesizing results from 20 studies and 5,865 men, the Semen Quality Measures in Hookah and Cigarette Smokers Compared to Nonsmokers Hamadneh 2025 The Scientific World Journal Wiley Online Library does chewing tobacco decrease sperm count Smoking and Infertility: Does Smoking Affect Sperm? tobacco effect on sperm does chewing tobacco lower sperm count How Smoking Affects Male Fertility?
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