Which of the following is an example of a primary risk factor?

• A. Alcohol Consumption
• B. Regular Exercise
• C. Balanced Diet
• D. Smoking

Answer: (D)

A primary risk factor is a behavior or condition that directly increases the chance of developing disease and is often a major, modifiable contributor. Smoking fits this description best because it has a strong, direct link to serious health problems such as heart disease, stroke, lung cancer, and chronic lung diseases. It’s a behavior that, when changed, tends to produce a clear reduction in risk.

In contrast, regular exercise and a balanced diet are protective factors that reduce risk rather than increase it. Alcohol consumption can raise risk when used irresponsibly, but smoking is the quintessential example of a primary risk factor due to its direct, well-established impact on multiple major diseases.