Abstract Smoking is a major risk factor for the development of aortic aneurysms. An unruptured abdominal aortic aneurysm was found when screening a patient for cardiovascular diseases who was referred to the smoking cessation clinic for the first time. A 63-year-old male with a past history of myocardial infarction was treated for diabetes mellitus, hypertension, and dyslipidemia in the department of cardiovascular medicine at Shizuoka General Hospital. The patient was referred to the smoking cessation clinic by his primary care doctor to quit smoking. An unruptured abdominal aortic aneurysm, 47 mm in diameter, was found via a sonography screening for cardiovascular disease; the patient was referred to the department of cardiovascular surgery for surgery. Routine screening with sonography for smoking patients who are referred to the smoking cessation clinic for the first time is recommended for early detection of abdominal aortic aneurysms.