The current study examined predictors of past 30-day cigarette use among a US nationally representative sample of pregnant women over the age of 18 (N = 1,782). The study consisted of secondary data analysis of the 2005-2007 survey years of the National Survey on Drug Use and Health (NSDUH). Logistic regression analyses indicated that low-income women, those who experienced mental health problems in the past year, and women who experienced legal problems were more likely to smoke during pregnancy. Limitations to the study as well as implications for future research are discussed.