Cigarette and E-Cigarette Perceptions About Harm During Pregnancy.

Pregnant women who smoked and used e-cigarettes had lower risk perceptions about e-cigarette use during pregnancy than those who only smoked. Health messages and research about the harms of nicotine exposure during pregnancy should address the risks of dual-use versus only e-cigarette use. Additionally, messages about the relative harm of e-cigarettes compared to cigarettes are needed for pregnant women who smoke and have trouble quitting.