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.
At its worst, emphysema can cause air hunger.. This is the constant feeling of being unable to catch one's breath. These respiratory symptoms are the same regardless of the cause of the emphysema. However, two people with the same degree of lung damage may have different symptoms. One person with mild emphysema may feel very short of breath. Another person with more advanced stages of the disease may be hardly bothered by symptoms.