Patient decision aids are tools that help people become involved in decision making by providing information about the options and outcomes and by clarifying personal values. It promotes shared decision making between the patient and practitioner, saves physician's time, and reduces practice variation. In smoking cessation area, patient decision aids has been developed to help the patients decide on whether to quit smoking or not (NHS, UK), and on whether to use smoking cessation medication or not (Healthwire, US; Willemsen, 2006). However, those decision aids were targeted to the Western population, thus limiting the generalizability of the utility of such tools in the population from other culture. To our best knowledge, there is no decision aid specifically tailored for Korean smokers, and we would like to develop one and evaluate its effect on their decision to use smoking cessation medication through this study.