STEVE PERCIVAL / SCIENCE PHOTO LIBRARY STEVE PERCIVAL / SCIENCE PHOTO LIBRARY
Passive smoking. Adult holding a lit cigarette in front of a baby's face. Inhalation of tobacco smoke by passive smoking is implicated as a major cause of asthma in children. It can also cause other respiratory problems such as wheezing, bronchitis, and lung cancer. Children exposed to passive smoking may be more likely to become smokers themselves.
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