The objectives of this study are to determine in a randomized controlled trial (RCT) whether a mobile health (mHealth) couples intervention shows promise in increasing smoking cessation among pregnant couples who smoke and to build mHealth research capacity in Romania. The intervention will be novel in its use of the unique functionality of smartphones, its emphasis on the dyadic efficacy for smoking cessation, and the focus on pregnant couples. Our aims are to (1) Test the implementation feasibility, acceptability, and initial efficacy of a culturally-adapted mHealth smoking cessation intervention among couples during pregnancy and postpartum in Romania. (2) Develop mHealth research capacity by enhancing individual and institutional research capabilities in Romania and expanding the existing international research network.

Inclusion Criteria:

• pregnant smokers in the 2nd or 3rd pregnancy trimester and their partners.
• 18 years or older
• married or in a stable relationship
• owns and uses an Android smartphone with broadband internet connection
• willing to have the partner contacted for participation.

Exclusion Criteria:

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