Which of the following are primary prevention methods for lung cancer? (Select all that apply)

A. Using sunscreen prevents skin cancer, not lung cancer. B. Reducing exposure to air pollutants decreases risk factors for lung cancer. C. Regular CT scans are a secondary prevention method (screening), not primary prevention. D. Vaccination against HPV helps prevent cervical and some other cancers, not lung cancer. E. Smoking cessation is the most effective primary prevention method for lung cancer. F. Chemotherapy is a treatment, not a prevention method.