ADULTERATED AIR TOBACCO 179 



naturally should have been both taller and of greater 

 lung capacity. 



Professor Seaver also kept accurate record of the 

 physical development made by the young men while 

 they were attending college. To find out what effect 

 tobacco might have in this respect, he grouped them 

 into three classes; namely, those who never used 

 tobacco, those who had used it for at least a year, 

 and those who used it irregularly. His records showed 

 that those who never used it increased in weight about 

 one-tenth more than those who had used it for a year 

 or more, and nearly seven-hundredths more than those 

 who used it irregularly. In height, the gain of the 

 non-users was nearly one-fourth more than that of 

 those who had smoked a year or more, and a trifle 

 over one-tenth more than that of the irregular user. 

 The gain in girth of chest for the non-users was slightly 

 more than one-fourth greater than that of the irregular 

 smokers. But the gain in lung capacity for the non- 

 smokers was greatest of all. In this respect they 

 were more than three-fourths ahead of the year or 

 more smokers, and almost one-half better than the 

 irregular smokers. 



Did the non-smokers also show greater ability as 

 students? Out of the hundred men who took the 

 highest rank at Yale while Professor Seaver was keep- 

 ing these records, only five were smokers. The other 

 ninety-five never used tobacco. Of all the students 

 taking rank below this hundred, however, three-fifths 



