Transitional smoking status during pregnancy.a The transitional smoking status among all smokers between the 3 months before pregnancy to the last 3 months of pregnancy by pre-pregnancy smoking intensity with the proportion of smoking cessation highlighted. aIncluded in analysis was 31 Pregnancy Risk Assessment Monitoring System (PRAMS) states (AK, AR, CO, DE, GA, HI, IL, MA, MD, ME, MI, MN, MO, MS, NE, NJ, NM, NY, OH, OK, OR, PA, RI, TN, TX, UT, VT, WA, WI, WV, and WY) and New York City during 2009–2011. bCategories of maternal report of average cigarette(s)/day on PRAMS survey. cPrenatal smoking cessation was defined as smoking in the 3 months before pregnancy, but not smoking during the last 3 months of pregnancy (ie, quitting).