Which of the following is NOT a risk factor for myocardial infarction?

The option identified as not being a risk factor for myocardial infarction is indeed cancer. Risk factors for myocardial infarction generally include conditions and lifestyle choices that directly affect cardiovascular health. Family history of coronary artery disease (CAD), hypertension, and smoking are well-established risk factors.

Family history of CAD signifies a genetic predisposition to heart disease, increasing the likelihood of experiencing a myocardial infarction. Hypertension causes increased pressure on the arteries, leading to damage over time and increasing the risk for heart attacks. Smoking is a significant risk factor due to its detrimental effects on blood vessels and overall cardiovascular health.

Cancer, while it can significantly impact overall health and may have indirect effects on lifestyle choices (such as reduced physical activity or dietary changes), does not have a direct physiological mechanism that contributes to the risk of myocardial infarction in the same way that the other factors do. Therefore, while it is an important health concern, it is not recognized as a direct risk factor for myocardial infarction.