Background: Smoking is considered to be risk factors of gastroesophageal reflux disease (GERD). The present study aimed to reveal whether quit smoking improves GERD symptoms and QOL of patients. Methods: In this prospective study, 33 patients who participated in a 12-week quit smoking program filled out the Frequency Scale for the Symptoms of GERD (FSSG) questionnaire, and SF8 QOL questionnaire. Patients filled out the questionnaires at baseline and during the program at 2 weeks, 4 weeks, 8 weeks and 12 weeks. In the FSSG, the responses were scored and the reflux score (RS), dysmotility score (DS) and total score (TS) were calculated. Results: There were 22 males and 11 females. Their mean age was 54.8 ± 13.0 (mean ± SD) yr, BMI was 22.9 ± 4.0, and duration of smoking was 33.5 ± 12.5 years. Ten patients belonged to GERD subgroup (baselineFSSGscore ≥ 8). All patients were successful at quit smoking. Scores of TS/RS/DS are 8.6 ± 1.8 (mean ± SE)/4.2 ± 0.9/4.5 ± 0.9 at baseline, 4