The vast inhibitor Tipifarnib majority of women did not smoke in either of the pregnancies (86.9%), and more women quit smoking (5.9%) than relapsed to smoking in their second pregnancy (2.1%), whereas a relatively small group smoked in both pregnancies (5.1%). Among those women who did not smoke in their first but who smoked in their second pregnancy, the distribution of occasional (44.9%) and daily smokers (55.1%) were fairly equal, whereas among those smoking in both pregnancies, the majority were daily smokers (80.9%). Also, the proportion of smoking partners was considerably higher among women smoking in their second pregnancy (55.7%) as compared with women quitting smoking by their second pregnancy (30.4%). The largest proportion of partners quitting smoking between pregnancies was found in the group of women who themselves quit smoking from their first to their second pregnancy.

Table 2 shows the adjusted odds ratios for quitting smoking prior to the second pregnancy among 1,193 women smoking during their first pregnancy. Among these smokers, 30.9% had quit smoking prior to their second pregnancy and stayed abstinent during the pregnancy. Younger women were somewhat less likely to quit smoking while educational attainment had no significant influence on quitting. Compared with women living with a partner who smoked prior to the second pregnancy, women living with a nonsmoking partner (OR, 2.54; 95% CI, 1.91, 3.38) or a partner who quit prior to the second pregnancy (OR, 5.50; 95% CI, 3.65, 8.28) had both an increased likelihood of themselves quitting by the second pregnancy.

Moreover, women who smoked occasionally in their first pregnancy were somewhat more likely to quit smoking prior to their second pregnancy as compared with daily smokers. Women reporting increasing levels of psychological distress across pregnancies had a lower likelihood of quitting smoking prior to their second pregnancy (OR, 0.79; 95% CI, 0.66, 0.94). Increasing number of years between pregnancies was negatively associated with quitting smoking, whereas year of birth before or after introduction of the smoking ban did not significantly influence quitting smoking. Table 2. Adjusted Dacomitinib Odds Ratios for Quitting Smoking Prior to the Second Pregnancy Among 1,193 Smokers During the First Pregnancy Table 3 shows the adjusted odds ratios for smoking during the second pregnancy among 9,697 women who did not smoke during their first pregnancy. Among these women, 2.3% did smoke during their second pregnancy. Age had no significant influence on smoking, whereas women holding education at a secondary level had an increased likelihood of smoking in their second pregnancy (OR, 2.29; 95% CI, 1.70, 3.08).