Inclusion Criteria:  Less than one month postpartum Live delivery Smoked at least 100 cigarettes/lifetime Smoked anytime during their most recent pregnancy English-speaking Own a mobile phone Provide an email address Willing to receive intervention-related texts Willing to complete surveys Willing to provide a saliva sample at the end of the study  Exclusion Criteria:  Women whose pregnancy did not result in live birth On a 7-point scale, participant indicates that they are not interested in quitting or staying quit in the next 6 months (Not at all = 1).