smoking do, that the use of tobacco is univer- 

 sally harmful. 



Fourthly, the conclusions arrived at by some 

 investigators, are based on experiments made 

 on animals, and it appears quite open to criti- 

 cism, and is in fact disproved by common ex- 

 perience, that such results will follow when ap- 

 plied to man. Hinging on this is the question 

 of immunity and toleration. The human system 

 will easily after use tolerate effects which at 

 first it rebels against. This may easily be seen 

 in muscular and other efforts. Let a man who 

 is constantly leading a sedentary life suddenly 

 walk 10 miles. The result is almost prostration 

 and he will not recover from it for a consider- 

 able time. Let him, however, commence by 

 walking a mile or two and gradually at each 

 walk increase the distance, and in a short while 

 he will be able to walk 10 miles without feeling 

 any fatigue. Similarly running or other rapid 

 exercise to a person not used to it will produce 

 such rapid disturbances in the respiration and 

 circulation as even to be fatal, while the sea- 

 soned athlete may perform such feats without 

 the least ill effects. 



To take animals or persons who have never 

 before used tobacco and to argue or conclude 

 that the effects of tobacco smoke on them are 

 the effects of tobacco on smokers generally is 



177 



