-- Mary Elizabeth Dallas
THURSDAY, Feb. 27, 2014 (HealthDay News) -- Breathing in someone
else's tobacco fumes might raise a woman's odds for miscarriage,
stillbirth or other complications, a new study suggests.
The study found that the risk to pregnancy rises the longer
women are exposed to secondhand smoke.
Researchers led by Andrew Hyland of the Roswell Park Cancer
Institute in Buffalo, N.Y., tracked data on more than 80,000
postmenopausal women who'd taken part in the landmark Women's
Health Initiative study.
All of the women had been pregnant at least once. Of these
women, 6.3 percent were smokers, 43 percent were former smokers,
and about 51 percent were nonsmokers. Hyland's team assessed how
much secondhand smoke the nonsmoking women had been exposed to as
children and adults, both at home and at work.
Nearly one in three of the participants had experienced at least
one miscarriage. Out of all the women, 4.4 percent experienced a
stillbirth and 2.5 percent had undergone a tubal ectopic pregnancy,
where the fertilized egg attaches outside the uterus.
Compared to women who had never smoked, women who used to smoke
during their reproductive years were 16 percent more likely to have
had a miscarriage, 44 percent more likely to have had a stillborn
child and 43 percent more likely to have experienced an ectopic
The study's authors noted there was also a link between
secondhand smoke exposure and complications of pregnancy among
women who never smoked. The longer the nonsmoking women were
exposed to the smoke, the greater their risk.
The team also focused on women with the greatest level of
lifetime exposure to secondhand smoke. These included women who
spent more than 10 years exposed to fumes as a child, more than 10
years as an adult working in a smoke-filled workplace, or more than
20 years as an adult exposed to secondhand smoke in the home.
These women were 17 percent more likely to have a miscarriage,
55 percent more likely to experience a stillbirth and 61 percent
more likely to have an ectopic pregnancy, compared to women without
these exposures, the study found.
Younger and more educated women, the study also showed, were
less likely to experience these complications of pregnancy than
black women and those of other minority ethnicities, as well as
women who were overweight.
While the study was able to show an association between
secondhand smoke and pregnancy complications, it wasn't designed to
prove cause and effect.
The findings were published online Feb. 26 in the journal
The U.S. Centers for Disease Control and Prevention provides
more information on the
health effects of secondhand smoke.
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