OSCAR BURRIEL / SCIENCE PHOTO LIBRARY OSCAR BURRIEL / SCIENCE PHOTO LIBRARY
Quitting smoking. Hands breaking a cigarette in half, symbolizing the act of stopping smoking. Giving up cigarette smoking is difficult because tobacco contains the addictive nerve stimulant nicotine. While tar in tobacco smoke produces chronic irritation of the respiratory system and causes lung cancer. Tobacco smoking has also been linked with a greater risk of chronic bronchitis and coronary heart disease.
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