Objectives: Smoking during pregnancy can result in negative effects in exposed children. It is well established that the smoking status of husbands is a major predictor of smoking among pregnant women. It was investigated whether the smoking status of the women's parents and parents-in-law has an impact on smoking cessation during pregnancy and relapse after birth above the smoking status of the husband.
Method: An initial sample of 458 women and their husbands was assessed prospectively during a 17-month period after birth regarding smoking habits. Five months after birth the women and their husbands reported the smoking status of their own parents.
Results: Smoking during pregnancy was related to the smoking status of the women's husband and mother. Women with a husband and mother who smoke were more likely to continue smoking. Relapse after smoking cessation during pregnancy was related to the smoking status of the husband and the mother-in-law. The smoking status of the women's father and father-in-law was not related to smoking cessation or relapse.
Conclusion: The smoking status of the pregnant women's mothers and mothers-in-law is related to fetal and newborn's nicotine exposure. The findings suggest benefits of taking the smoking status of pregnant women's mothers and mothers-in-law into account in smoking prevention programs for pregnant women and mothers with infants.