(Full disclosure: both have been close colleagues of mine for many years.) A shrinking circle Fifty years ago, when the Surgeon General issued his famous document summarizing the health risks of smoking, more than 40% of American adults smoked
Two to three months later, blood circulation improves making it easier to go for long walks because lung capacity is increased by up to 30 percent
The case is complicated by the fact that Canada is a "dark market" for cigarettes that is, except for some specialty shops, cigarettes are not displayed openly
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)
4 FIGURE 1
