BSIP, JOLYOT / SCIENCE PHOTO LIBRARY BSIP, JOLYOT / SCIENCE PHOTO LIBRARY
Cigarettes. An arrangement of two kinds of cigarette. 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. The carbon monoxide in cigarette smoke passes from the lungs into the bloodstream. High levels of carbon monoxide cause hardening of the arteries which increases the risk of coronary thrombosis and stroke.
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