Smoking Diseases
Emphysema is a lung disease that kills around 20,000 people in Britain every year. Smoke damages the walls of the alveoli, which break down and fuse together, forming enlarged irregular air spaces. This greatly reduces the surface area for gas exchange which becomes very inefficant, and so the blood carries less oxygen.
Lung cancer is caused mainly by smoking-cigarette smoke contains a strongly addictive drug, nicotine, as well as 17 chemicals which cause cancer, which contain tar. Cancer happens when cells start to divide uncontrollably, forming a tumor which causes the cancer to spread to other tissues.
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