The well established risk factors are high blood pressure, high blood cholesterol, cigarette smoking and diabetes mellitus. Other factors that may increase or affect the risk for heart attach are obesity, a sedentary life-style, an aggressive response to stress, and certain drugs. Clinical studies, laboratory investigations and a number of surveys show certain personal characteristics and life-styles pointing to increased danger of heart attack (coronary heart disease). These danger signs are called "risk factors".
Obesity predisposes individuals to coronary heart disease. Some of the reasons for this are known, but others are not. The major causes of obesity in Americans are excessive intake of calories and inadequate exercise. When caloric intake is excessive, some of the excess frequently is saturated fat, which further raises the blood cholesterol. Thus, obesity contributes to higher coronary risk in a variety of ways.

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People who use needles to inject drugs (including mainliners and skin poppers) get the virus by sharing their works with other users who already have the AIDS virus in their blood. The two groups at greatest risk for AIDS are homosexual or bisexual men and people who shoot drugs. Symptoms of AIDS may not show up for many years and some remain without symptoms even then. Thousands of IV drug abusers already have AIDS, and many thousands more are carriers of the virus. The AIDS virus is not spread through normal daily contact at work, school or home. There have been no cases found where the virus has been transmitted by casual contact with AIDS patients in the home, workplace, or health care setting.

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