Purpose: The purpose of this study was to investigate smoking history and quality of life in the patients with coronary artery disease (CAD). Method: Data were collected from 157 men who quit smoking or attempted to quit smoking. Quality of life was measured with the SCQoL(smoking cessation quality of life) scale which was developed by Olufade et al. (19?19), and includes 5 factors; social interactions, cognitive functioning, self control, anxiety, and sleep. Result: The patients usually smoking in their twenties (61.8%), continued to smoke for over 30 years (70.7%), and smoked 20-29 cigarettes a day (50.3%). The total mean scores for the SCQoL was $50.48{pm}7.11$. Of the 5 factors, self control had the highest mean score ($17.00{pm}3.79$). Patients who began smoking in their twenties had a higher SCQoL. However, there were no significantly differences in the SCQoL according to duration of smoking or amount of smoking per day. Conclusion: Age when smoking is begun is an important variable to explain SCQoL in patients with CAD. But, further study is needed to identify the influence of other variables such as duration and amount of smoking.