THE BLOOD AND ITS CIRCULATION 381 



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

 cigars or cigarettes li>- 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-gi\ing 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. 



