Carcinogens are substances or factors that can lead to cancer by causing damage to the DNA in cells. This damage can result in mutations, which may lead to the uncontrolled growth of abnormal cells, a hallmark of cancer. Common examples of carcinogens include tobacco smoke, certain chemicals and pollutants, radiation, certain viruses, and some medications. Exposure to these agents can occur through various means such as inhalation, ingestion, or direct skin contact. To reduce the risk of developing cancer, it is crucial to minimize exposure to known carcinogens and adopt healthy lifestyle choices.