The study is conducted in the city of Sanlıurfa as a descriptive study, and the aim of the study is to determine the smoking exposure and affecting factors in pregnant women. Sample size is calculated as 256; the estimated smoking cessation rate is 4.4%, the error limit is 2.5% and confidence interval is 95.0%. In the study, it was reported that 9.8% of pregnant women smoke and the average amount of cigarettes smoked per day during pregnancy is 5.3 ± 4.4. For the pregnant women; the mean duration of smoking before pregnancy is 4.6 ± 3.8 years and the average amount of cigarettes smoked per day is 8.9 ± 7.0. Of the women; 41.8% are exposed to secondhand tobacco smoke at home, since their husbands smoke; 55.1% are exposed to secondhand tobacco smoke at home due to their relatives; and 27.3% are exposed to secondhand tobacco smoke at work. In univariate analyzes, the smoking exposure is found to be higher in the Turkish speaking families than in the Kurdish and Arabic speaking families and in the families in which the husbands earn money than in which husbands don't earn money (p <0.05). Although the rate of pregnant women who smoke is lower than the total value of Turkey; the rate of passive exposure to tobacco smoke is higher. In the light of these results, it is suggested that antenatal care health personnel should provide counseling services regarding harms and passive smoking should be provided to pregnant women, their spouses and their family members and that these informing, counseling and prevention activities for smoking should be performed and generalized throughout Turkey.