Exercise may help pregnant women stop smoking

LONDON, Sep 23, Physical exertion may help pregnant women stop smoking, researchers said on Tuesday, after two small studies showed a quarter of women who exercised regularly while expecting a babyquit smoking.

The British scientists said the quitting rate was about the same as for people who use nicotine replacement.

"Our findings suggest that a physical activity intervention is feasible and acceptable as an aid to smoking cessation during pregnancy," Michael Ussher and colleagues from St. George's University of London, wrote in the journal BMC Health.

• Nicotine -- one of the most addictive substances known -- can lead to lower birth weight, higher infant mortality and is linked to learning difficulties and health problems in childhood.
  
  An estimated 17 percent of British women and 20 percent of women in the United
  States say they smoke during pregnancy, the researchers said.
  
  Nicotine patches are one way to help smokers give up, but there are worries
  they may harm the fetus, leaving exercise as a healthy alternative for
  pregnant women, the researchers said.
  
  The two pilot studies included women over 18 who smoked at least one cigarette
  a day and were 12 to 20 weeks into their pregnancy.
  
  In one trial, women exercised under supervision once a week for six weeks
  while in the other they worked out twice a week for the same length of time
  and then once weekly for three weeks. All received counseling and help to stop
  smoking.
  
  The women exercised at a moderate pace and the main activity was walking, the
  researchers said. A quarter of the 32 women gave up smoking before giving
  birth, the studies found.
  
  The researchers, who are now conducting a larger trial of more than 850
  women, did not say why exercise appears to make a difference but previous
  research has linked physical activity to reduced cravings during pregnancy.