Read the paragraph and answer the questions. Second-hand smoke is the smoke that comes from the burning end of a

Read the paragraph and answer the questions. Second-hand smoke is the smoke that comes from the burning end of a cigarette, pipe or cigar and the smoke that is produced by a smoker. Second-hand smoke is breathed in by adults and children who are near people who are smoking. Millions of children and adults suffer from it each year. Second-hand smoke contains more than 250 toxic chemicals that can make people sick. More than 50 of these chemicals cause cancer in humans. Studies show that children exposed to second-hand smoke have more colds, more ear infections and more respiratory infections such as bronchitis and pneumonia than children who do not breathe second-hand smoke. How harmful is the second-hand smoke? What can we do to prevent this?