Unrestricted parental smoking habits are lifestyle risk behaviors associated with chronic, systemic inflammation, which promotes the pathogenesis of non-communicable diseases (NCDs). Exposure to secondhand tobacco smoke in early life contributes to the development of specific NCDs in children, i.e. asthma. Early preventive measures to improve lifestyle behavior in parents are therefore of utmost importance. The aim of ELIPSE-II is to assess whether an eHealth application intervention for parents is feasible and efficacious in lowering levels of urinary cotinine as a measure of second-hand smoke exposure in their children .