New studies suggest that physical exercise may help pregnant smokers to quit, Reuters reported Sept. 22.

Two different exercise routines consisting of moderate walking were developed for study participants, who also received counseling and other aid to stop smoking. Researchers report that one-quarter of the studies' participants were able to quit smoking, a rate similar for people who use nicotine patches to quit.

Researchers from St. George's University of London said the findings reveal that an exercise regimen is "feasible and acceptable as an aid to smoking-cessation during pregnancy."

Previous research has suggested a link between exercise and a reduction in craving during pregnancy. The researchers are conducting a further trial with more than 850 women participating.

The research appears online in the journal BMC Health.