Norway participated in an international multicenter study on drug use, smoking, alcohol consumption, antenatal care, and complications in pregnancy. 482 women were interviewed at Akershus Central Hospital (near Oslo) and Haukeland hospital (in Bergen). Interviews were conducted during one of the first days after delivery using a standardized form. We found that 75% of the pregnancies were planned, while 7% were the result of contraceptive failure. 35% of the women smoked during pregnancy, compared with 43% before pregnancy. However, in relation to the early period of pregnancy the amount of tobacco consumed and the percentage of smokers increased slightly towards the end of pregnancy. Women who smoked were hospitalized during pregnancy more often than non-smokers. 91% of the women used some kind of medication during pregnancy including iron and vitamins.