A characteristic or condition (such as smoking)that occurs with greater frequency in people with a disease (such as lung cancer)than it does in disease-free people is known as a:

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A risk factor is a characteristic, condition or behavior that increases the likelihood of developing a disease. In this case, smoking is a risk factor for lung cancer because it occurs more frequently in people with lung cancer than in those without the disease. Pathogens and viruses are infectious agents that can cause diseases, and immunogens are substances that stimulate an immune response to protect against diseases. None of these terms accurately describe a characteristic or condition that is associated with a higher risk of developing a disease.

A Characteristic or Condition (Such as Smoking)that Occurs with Greater