EVAN OTO / SCIENCE PHOTO LIBRARY EVAN OTO / SCIENCE PHOTO LIBRARY
An illustration of the lungs affected by smoking. Smoking has been causally linked to respiratory disorders such as lung cancer, laryngeal cancer, tracheal cancer, pneumonia, chronic obstructive pulmonary disease, tuberculosis and asthma. Smoking also causes the lungs to develop a dark or decayed appearance due to the exposure and accumulation of tar and other chemicals found in cigarettes.
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