Smoking linked to reproductive changes in both sexes
A mouse study suggests that cigarette smoke exposure can alter reproductive biology in both sexes. In females, ovarian follicles changed little structurally, but genes involved in cell division and metabolism became less active. In males, higher smoke exposure was linked to enlarged seminiferous tubules and shifts in gene activity.
The study compared mice exposed to varying levels of cigarette smoke, examining ovaries and testes. In female animals, follicle counts and shape remained largely stable, yet many genes changed activity. Those tied to cell division and metabolism were quieter, while protein-making genes were busier, resembling patterns seen in ovarian aging and diminished ovarian function.
In males, greater smoke exposure coincided with wider seminiferous tubules, where sperm mature. Gene activity also shifted: some sperm-production genes increased, while immune-related ones decreased, alongside changes in cell signaling. The authors say these findings suggest possible mechanisms, though human fertility effects remain unproven.
This mouse study may add to public understanding of smoking's reproductive risks, potentially influencing how individuals of reproductive age think about cessation and preconception health. Clinicians and fertility services could use such findings to discuss lifestyle factors, though species differences mean the results cannot yet predict human outcomes. The impact may be greatest for those already facing infertility, who might seek clearer guidance.