Which of the following is a method used in primary prevention?

Primary prevention focuses on preventing diseases or health issues before they occur, rather than treating or managing them after they've developed. Smoking cessation programs are a quintessential example of primary prevention, as they aim to help individuals quit smoking, thereby reducing the risk of developing smoking-related diseases such as lung cancer, heart disease, and respiratory illnesses. By targeting the behavior of smoking before any adverse effects have manifest, these programs contribute directly to an individual’s overall health and to the prevention of illness within the population.

In contrast, chemotherapy is a treatment method used after cancer has been diagnosed and is not a preventative measure. Mammograms are a screening tool that can detect breast cancer at an early stage, which may fall under secondary prevention aimed at early detection rather than prevention. Physical rehabilitation is typically a therapeutic approach for individuals recovering from injuries or surgeries, which focuses on restoring function rather than preventing disease from occurring in the first place.