A Study to Test Feasibility and Acceptability of an Intervention Program Aiming to Reduce Prenatal Secondhand Smoke Exposure

The intervention focus on raising knowledge about the health consequences of prenatal secondhand smoke exposure, proposing strategies to avoid exposure at home and in the car, and raising motivation to implement a smoke-free home and car. An "exposure score" of each participant is calculated, based on his perception of secondhand smoke exposure, smoking rules within the home and strategies used to reduce exposure. Participants are guided in setting specific goals, with a detailed action plan, and receive ongoing feedback throughout follow up. In addition, for pregnant women, urine cotinine measurements at baseline, 4-weeks and 12-weeks study visit are integrated into the intervention and personalized biofeedback provided to them . Participants of the intervention arm also receive remiders (by WhatsApp) to re-use the App during all the follow-up period (3 times during the first week, 2 times/week during the 2nd, 3th and 4th weeks, and then once a week until the end of follow-up).