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请用一句话概括这段话的意思
Since then,public education about smoking has been a rousing success:since 1965,a year after the first definitive health warning,the rate of smoking in America has declined from more than 4o% to about 25%,and the number of ex-smokers has trebled.Surveys show that by now the public,including smokers themselves,have a greatly exaggerated notion of smoking's peril; Mr Viscusi,for instance,has found that the chances of getting cancer from cigarettes are typically overstated by a multiple of four or more.Plainly people have been duly informed.If they continue to smoke,that is not because anyone has fooled them.
Since then,public education about smoking has been a rousing success:since 1965,a year after the first definitive health warning,the rate of smoking in America has declined from more than 4o% to about 25%,and the number of ex-smokers has trebled.Surveys show that by now the public,including smokers themselves,have a greatly exaggerated notion of smoking's peril; Mr Viscusi,for instance,has found that the chances of getting cancer from cigarettes are typically overstated by a multiple of four or more.Plainly people have been duly informed.If they continue to smoke,that is not because anyone has fooled them.
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