Although the disc media and the drives of the CD and CD-ROM are, in principle, the same, there is a difference in the way data storage is organized. Two new sectors were defined, Mode 1 for storing computer data and Mode 2 for compressed audio or video/graphic data.
Emphysema Causes. Cigarette smoking is by far the most dangerous behavior that causes people to develop emphysema, and it is also the most preventable cause. Other risk factors include a deficiency of an enzyme called alpha-1-antitrypsin, air pollution, airway reactivity, heredity, male sex, and age. The pollutants cause inflammation in the airways, leading to lung tissue destruction. 2  Close relatives of people with emphysema are more likely to develop the disease themselves. 3  This is probably because the tissue sensitivity or response to smoke and other irritants may be inherited.
The most common cause of emphysema is cigarette smoking, although rare forms of emphysema may occur in non-smokers. Emphysema may be present with other lung diseases, such as chronic bronchitis and asthma.Like emphysema, these diseases are made worse by cigarette smoking.Emphysema and chronic bronchitis are often grouped together and commonly called chronic obstructive pulmonary disease (COPD). Exposure to air pollution and noxious particles or gases could also cause or worsen these conditions.he most common cause of emphysema is cigarette smoking, although rare forms of emphysema may occur in non-smokers. Emphysema may be present with other lung diseases, such as chronic bronchitis and asthma.