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Smoking negatively affects sperm motility and semen antioxidant levels 

Results from a prospective study have confirmed that cigarette smoking reduces sperm motility, decreases the antioxidant capacity of the semen, and increases the risk forleukocytospermia.

"Numerous investigations have been conducted on the relationship between cigarette smoking and male infertility; however, the exact molecular mechanisms are not well understood," write Fabio FirmbachPasqualotto and colleagues from the University of Caxias do Sul in Brazil.

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