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Smokers May Tilt Gender Odds Toward Girls
An Lancet study of 11,815 Japanese births finds overall 104 boys per 100 girls. When neither parent smoked the ratio is 121:100 in favor of boys, while both partners smoking a pack daily shifts to 82:100, suggesting heavy smoking around conception lowers male births. Researchers caution unclear mechanisms.
MENTIONED IN THIS ARTICLE
London
Lancet Medical Journal
Henrik Moller
William James
University College In
United States
James
Moller
Imperial College