CRISTINA PEDRAZZINI / SCIENCE PHOTO LIBRARY CRISTINA PEDRAZZINI / SCIENCE PHOTO LIBRARY
Smoked cigarettes. Close-up of cigarette butts and ash 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 which can lead to chronic bronchitis, emphysema, and an increased risk of lung cancer and heart disease.
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