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Without regards to person's past or present health history Given: an average healthy person. Reason 1 "Tar - settles in the lungs and stimulates a series of changes that lead to obstructive lung disease and lung cancer" Reason 2 "Emphysema is the condition in which bronchioles collapse, leaving large spaces where surface area for gaseous exchange used to be. This is because the lungs are constantly infected, ... The initial inflammation is caused by infections which in turn is caused by the accumulated mucus as a result of the tar in the lungs. " Reason 3 "Lung function will deteriorate and people with severe emphysema may need a supply of oxygen through a face mask to stay alive." http://en.wikibooks.org/wiki/A-level_Biology/Human_Health_and_Disease/smoking_and_disease
Reason 1: Scientists say there are over 4,000 compounds in cigarette smoke. A sizable number of them are toxic - they are bad for us and damage our cells. Some of them cause cancer - they are carcinogenic. Tar and Carbon Monoxide are reported to be in cigarettes Reason 2: Cigarettes cause cancer. Smoking is the number one cause of deaths due to lung cancer, emphysema, and other serious diseases. Reason 3: It WILL eventually kill you. Smokers live an average of 25% fewer years than non-smokers.