In secondhand smoke, the release rate of many compounds in sidestream smoke is often higher than that in mainstream smoke.
Secondhand smoke is also called environmental tobacco smoke. Secondhand smoke includes mainstream smoke exhaled by smokers and sidestream smoke directly discharged from cigarettes, cigars or pipes.
Secondhand smoke is more dangerous than previously known. Some people who live with smokers are six times more likely to develop lung cancer than ordinary people.
The hazards of second-hand smoke to people's health mainly include: childhood asthma, sudden infant death syndrome, tracheitis, pneumonia and ear inflammation.
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