Smoking has detrimental effects on asthma sympom control and response to treatment and is prevalent among astma patients in South Korea. The aim of study is to determine the prevalence of smoking among asthma patients in South Korea and to compare the medication regimens of astma patients who do and do not smoke. Methods: A cross-sectional survey was conducted from August 2010 to January 2011. Participating physicians (N=25) recorded demographic and clinical data on all astma patients presenting during the study period (N=2,032), and then recruited a subset of patients (N=500) for the survey such that half were self-reported current smokers. Recruited patients were between the ages of 18 and 60. In South Korea, physicians are well aware of the smoking status of their patients. However smoking status did not affect the prescribed medication regimens of this population of asthma patients.