Cigarette smoking and semen quality.
D000328:Adult; D006801:Humans; D007248:Infertility, Male / Q000209:etiology*; D008297:Male; D012306:Risk; D012661:Semen / Q000166:cytology*; D012907:Smoking; D013076:Sperm Count; D013081:Sperm Motility; D013094:Spermatozoa / Q000166:cytology; D014646:Varicocele / Q000150:complications