The U Surgeon General's Warning reads: "Smoking Causes Lung Cancer.

The U Surgeon General's Warning reads: "Smoking Causes Lung Cancer, Heart Disease, Emphysema."
Ye further how do you know? Just because someone says so?
We know because of the work of a special arrange of scientists. Let's call them the disease detectives, the detectives of the medical world. They search for the causes of disease.
And they have learned by what mode to study other things that affect our health. They have base things in the environment that can be harmful--like asbestos and lead. And they showed on what account we should wear seat belts in cars.
Of all

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