Sociology is the study of human social relationships and institutions. Sociologyâs subject matter is diverse, ranging from crime to religion, from the family to the state, from the divisions of race and social class to the shared beliefs of a common culture, and from social stability to radical change in whole societies.
Smoking leads to the lung disease, emphysema. In smokers, the presence of irritants in the mucus build up in the lungs and causes inflammation. A large number of phagocytic white blood cells migrate to the alveoli. The elastase produced by these cells breaks down elastin and other proteins in the wall of the alveoli.
Cigarette smoking. Cigarette smoking is the leading cause of lung cancer, accounting for about 85% of lung cancers. Risk for lung cancer increases with the duration, intensity and depth of smoke inhalation. Second-hand (passive) smoking also causes lung cancer, but is less strongly associated compared to active smoking.