Smoking tobacco can have serious health consequences. It contains nicotine, a highly addictive stimulant, as well as over 7,000 toxic chemicals that are linked to cancer and cardiovascular disease. Smoking is the largest preventable cause of death worldwide, killing over 8 million people annually. Treatment for nicotine addiction includes behavioral interventions, nicotine replacement therapies like patches and gum, and relapse prevention programs. The goal is to help smokers quit and sustain abstinence from tobacco.