Smoking is the largest preventable cause of disease and premature death. Nicotine reaches the brain within 10 seconds of inhaling smoke and has been found throughout the body, including breast milk. Cancer-causing agents in tobacco smoke damage genes controlling cell growth, causing abnormal or rapid cell reproduction leading to lung diseases, heart disease, cancer, and other health issues. People should quit smoking to save money, improve health, and enhance taste and smell. Governments implement anti-smoking campaigns and policies like raising tobacco taxes and restricting product promotion to encourage smoking prevention and cessation.