This study will enroll pregnant women who participated in the New England SCRIPT study, which drew from a predominately low-income, multi-ethnic population. There will be no study visits specifically for this study. Study researchers will analyze participants' SCRIPT study data from four surveys collected at baseline, during the third trimester, and 6 weeks and 6 months following childbirth. Researchers will analyze the following study data: smoking behavior, attitudes toward smoking, self-reported smoking status, number of cigarettes smoked per day, use of the assigned smoking cessation materials, and infant birth weight. Demographic information, including the participant's age, race and ethnicity, years of education, age of the fetus at study entry, and smoking practices of other household members, will also be examined. Urine samples collected from participants during the SCRIPT study will be analyzed for the 3-HC:C biomarker. This current study will use a new technique, liquid chromatography/atmospheric pressure ionization tandem spectrometry, to measure both cotinine and hydroxycotinine levels in the urine samples.