E-cigarettes have the potential to help smokers who cannot or will not quit tobacco smoking, by delivering nicotine without the toxicity of tobacco smoke. Anecdotal evidence, including from our ongoing work, suggests that e-cigarettes may have helped tobacco smoking cessation during pregnancy. However, the current evidence of e-cigarette efficacy for smoking cessation is inconclusive and the risks from long-term use of e-cigarettes are unknown. There is limited research on the ethical questions raised by e-cigarette use for tobacco cessation and the controversy around it. The objectives of this proposed supplement are to (1) identify ethical concerns and associated attitudes and perceptions related to e-cigarette use for tobacco cessation during pregnancy among relevant stakeholders, and (2) to continue building build mHealth research capacity in Romania. The research is novel in the broad range of perspectives elicited through an in-depth qualitative research approach.