THE BLOOD AND ITS CIRCULATION 381 



Effects of Tobacco upon the Circulation. " The frequent use of 

 cigars or cigarettes by the young seriously affects the quality of the blood. 

 The red blood corpuscles are not fully developed and charged with their 

 normal supply of life-giving oxygen. This causes paleness of the skin, 

 often noticed in the face of the young smoker. Palpitation of the heart 

 is also a common result, followed by permanent weakness, so that the 

 whole system is enfeebled, and mental vigor is impaired as well as phys- 

 ical strength." Macy, Physiology. 



