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Ethics declarations Ethics approval and consent to participate This study was reviewed and approved by the Ethics Committee of Jilin University School of Public Health (No.2015-12-08), and written informed consent was obtained from all subjects before they participated in the study

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Almost every developing organ system, including the lungs, brain, heart, and ears, appears to be affected by prenatal exposure to tobacco 15,29,30 (Figs 1 and 2)

Tobacco-induced oxidative stress causes breaks in the DNA contained within sperm

But they are not getting a fraction of the highly motivating exposures that were a big part of our earlier rapid declines