More than twenty American states ban smoking in public.     1     study has proved that smoke-free laws can reduce a major effect of tobacco—heart disease.The study     2     (take) place in Pueblo, Colorado several years ago. In some states, there were 396 heart attack     3     (patient) in the year before the ban in hospitals.

However,18 months     4     the ban, the number was 237. Smoking in enclosed (封闭的) places is very     5     (harm) to non-smoke. Adults may think they are     6     (actual) protecting their children from second-hand smoke when they smoke outside their homes, or when the children are not there. However, researchers     7     (warn) of what they call “third-hand smoke” so far. When you smoke they say, dangerous matter from tobacco smoke gets into     8     (you) hair and clothing. Then, when you touch a baby, the baby comes into contact with that poisonous matter. The researchers also found that people,     9     agreed that smoke was bad for children’s health, were more likely to have restriction on     10     (smoke) in their homes than others.