CONOR CAFFREY / SCIENCE PHOTO LIBRARY CONOR CAFFREY / SCIENCE PHOTO LIBRARY
Cigarette smoking. Woman's hand extinguishes a lit cigarette in an ashtray. Tobacco contains the stimulant nicotine which is responsible for the addictive nature of cigarette smoking. The tar and particles in tobacco smoke irritate the linings of the respiratory system leading to chronic bronchitis, emphysema and an increased risk of lung cancer.
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