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An additional factor that may explain why former smokers who ceased all nicotine use had higher odds of hypertension than those who switched to e-cigarettes is post-cessation weight gain

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How do you reach those calculations

Even though everyone and his uncle is now aware of the lethal dangers of smoking and its toll on society, the question that is not taught in public health schools or acknowledged by public health organizations, is, When did the medical and public health communities learn about the harmfulness of cigarettes and what did they do about it? The much-avoided answer is that the public health community knew no later than the 1930s through the epidemiologic work of Raymond Pearl at Johns Hopkins and the clinical reports of Alton Ochner at Tulane