The study will be introduced to pregnant smokers age 18-45 by clinic staff at the DMC prenatal care clinic located at the University Health Center, or at a UPG prenatal care clinic. Medical staff will give potential participants a flyer briefly describing the study and providing a link to a website (www.mommycheckup.net). Participants who meet all inclusions and exclusion criteria and pass the quiz will be randomized to one of the eight possible combinations of the three different interventions: Brief intervention, SmokeFreeMoms texting, or Quitline referral. This use of a factorial design to examine the relative efficacy of various intervention components is consistent with the Multiphase Optimization Strategy (the MOST) approach. Follow-up evaluation will take place at 4 weeks, and will have two elements, one computer- or mobile device-based and the other involving provision of a saliva/urine and breath sample. These will be done separately (if the participant does the online version remotely) or together (if the participant does the online component while providing the samples). Online follow-up: Participants will be sent a link to the online system, through which they will be asked about smoking. The clinic follow-up assessment will be performed at the next clinic visit. All participants will be asked to provide a urine sample (to be tested for cotinine, a biomarker of cigarette smoking) and a breath sample (to be tested for carbon monoxide level).