person suffering from it was a user of tobacco 
and to allege, therefore, that tobacco was the 
cause of the condition. It must be shown con- 
clusively that no other circumstances than the 
use of tobacco could have caused this condition. 
Dr. T. W. Jenkins, of Albany, N. Y., (New 
York Medical Journal, 1915, V. 102, p. 855), 
who was awarded a prize by this leading medical 
journal for his essay on tobacco smoking says: 
“The first thing to bear in mind is that con- 
sidering the large amount of tobacco used very 
little harm results, and care should be taken 
not to incriminate tobacco when the troubles 
under observation may be due to other causes.” 
Secondly, among the investigators themselves 
who have made impartial inquiries about the 
effects of tobacco, there is sometimes a wide dif- 
ference of opinion in the interpretation of re- 
sults and in the relation of cause and effect. 
Thus most varied opinions exist on the subject 
of nicotine. The result is that it is difficult for 
the average man to come to a satisfactory con- 
clusion on the subject; for it cannot be said 
that the scientific knowledge of the effects of 
tobacco smoking on the human system as pre- 
sented to us today is final or sufficiently well 
determined to enable definite and true conclu- 
sions to be arrived at. 
175 
