These days, drug companies and health professionals alike are focusing their attention on cholesterol in the blood. The more cholesterol we have in our blood, the higher the risk that we shall die of a heart attack. The issue is pertinent since heart disease kills more North Americans every year than any other single cause. At least three factorssmoking, drinking, and exercise can each influence levels of cholesterol in the blood.
Which one of the following can be properly concluded from the passage?
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