In the screening phase of the Bezafibrate Infarction Prevention Study Group, for example, the mean serum HDL cholesterol concentration was 40 mg / dL (1 mmol / L) in nonsmokers, 37 mg / dL (1 mmol / L) in former smokers, and 35 mg / dL (1 mmol / L) in current smokers with an intake of two packs per day or more [12].