Secondhand smoke linked to miscarriage

A study at the University of Buffalo concludes that secondhand smoke could be linked to pregnancy loss, including miscarriage, stillbirth and tubal ectopic pregnancy. The research is noteworthy  because it's the first to consider lifetime secondhand smoke exposure rather than only during pregnancy or reproductive years. Also, the comparison group of never-smokers was limited to women without any secondhand smoke exposure, which is a more accurate control group than used in previous studies.

This study looked at historical reproductive details, current and former smoking status and details about secondhand smoke exposure over the lifetime of 80,762 women from the Women’s Health Initiative Observational Study.

Women with the highest levels of secondhand smoke exposure had significantly greater estimates of risk for all three adverse pregnancy outcomes, and these risks were similar to what was seen among women who actually smoked in their lifetime. The highest levels of lifetime secondhand smoke exposure were defined by childhood exposure for longer that 10 years, adult home exposure for more than 20 years and adult work exposure for more than 10 years.

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Sourced from: Science Daily, Secondhand smoke exposure linked to adverse pregnancy outcomes