FIGURE 1.

Percentage of women using snus and/or cigarette smoke during pregnancy based on self-reported time for stopping from those who completed both 18-week and 34-week questionnaires (n=2187). Time for stopping categories were from 1–2 weeks to >16 weeks and from <17 weeks to 30–34 weeks, respectively. Among the women who reported the use of snus, cigarette smoke or dual use at some time during pregnancy, most stopped when they recognised their pregnancy (mean pregnancy week three to four). Week 0 reflects the total percentage of women who reported any use during pregnancy. E-cigarettes and nicotine replacement therapies were not included since the rates were low.