Aim: The research is planned to determine the rate of smoking during pregnancy and the effecting factors. Material and Method: The research is descriptive and cross-sectional design. It was conducted at the Public Hospitals Association a research hospital with at the Public Health Directorate a family health center over the period December 17, 2012 and December 17, 2013 with a total of 815 pregnant women. A questionnaire which contains socio-demographic, obstetric-gynecologic and the smoking characteristics of women is used in collecting data for this study. The percentage distribution is used in statistical evaluation and chi-square test was used in comparison of the qualitative data. Results: The rate of smoking during pregnancy was found to be 11.9%. The factors effecting smoking status during pregnancy are the number of pregnancies experienced, the gestational age, the planning status of the pregnancy, living children, to be the frequency of antenatal check-ups, the spouse smoking status, and passive smoking respectively. Multigravida, during the first trimester of pregnancy, unplanned pregnancy ones, those with living children, pre-natal care receiving with the frequency of under four, and those with her husband in smokers and passive smokers are more likely than other women for rate of smoking in pregnant women (p<0,05).Conclusion: In pregnancy follow-ups, by determining the factors effecting smoking status, smoking during pregnancy and passive smoking can be reduced through counselling and education services. By this way, the effects of smoking on mother, baby and pregnancy can be reduced.