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Constantinos Glynos said: The observed detrimental effects in the lung upon e-cigarette vapor exposure in animal models highlight the need for further investigation of safety and toxicity of these rapidly expanding devices worldwide. The researchers conducted their experiment by exposing different groups of mice to cigarette smoke, various e-cig vapors or clean air four times each day, with every session separated by 30-minute smoke-free intervals

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To accomplish this is the object of the machine under consideration, which is so constructed as to imitate the motions of a smoker, who, at regular intervals, would inhale a definite volume of air with a definite and constant force of suction.I am omitting the middle of the article because it focuses on the mechanics of Parenty's Smoking Machine, but if you are interested you can find it in issue 54 of Scientific American (23 January 1886)

After 24 hours: Your risk of having a heart attack starts to drop