DAMIEN LOVEGROVE / SCIENCE PHOTO LIBRARY DAMIEN LOVEGROVE / SCIENCE PHOTO LIBRARY
Quitting smoking. Hand crushing cigarettes, symbolizing the act of stopping smoking. Giving up smoking is hard as cigarette tobacco contains the addictive nerve stimulant nicotine. Nicotine patches and inhalers have been developed to provide the body with an alternative source of nicotine when stopping smoking. Tar in the tobacco smoke will, over a period of time, stain the skin of a smoker's hand. It 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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