Smoking during pregnancy is an important, preventable risk factor for late fetal death and even SIDS. There is a strong dose-response relationship between cigarette smoking and spontaneous abortion, reduction in birth weight, abruptio placentae, placenta previa and bleeding during pregnancy. Ten years ago, the prevalence of smoking among Norwegian pregnant women was between 35 and 40%. During the last 8 years there has been a dramatic change and in 1995 the prevalence seems to be around 20%.