While a large number of women quit or reduce smoking upon pregnancy recognition, many resume smoking postpartum."Although women decreased their tobacco consumption across their pregnancy, by nine months postpartum they had substantially increased their smoking," said study author Shannon Shisler."Increase in tobacco consumption after the birth of a child may have harmful effects on both the mother and the infant, who is at higher risk of exposure to environmental tobacco smoke," Shisler added.

Previous research has estimated that approximately 70 percent of women, who quit smoking during pregnancy, relapse within the first year after childbirth.And of those who relapse, 67 percent resume smoking by three months and up to 90 percent by six months.The new study indicated that the only significant predictor of change in smoking behaviour for women, who smoked during pregnancy, were among those who breastfed their infants.

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