short-term effects include irritation in the eyes, nose and throat, and upper respiratory infections such as bronchitis and pneumonia.Other symptoms can include headaches, nausea, and allergic reactions. Short-term air pollution can aggravate the medical conditions of individuals with asthma,emphysema etc...
Long-term health effects can include chronic respiratory disease, lung cancer, heart disease, and even damage to the brain, nerves, liver, or kidneys.
Some researches made some years ago showed up that half a million people die prematurely every year in the U.S. as a result of smoking cigarettes.
Wacth this video and see for your own eyes what is happening in the world :
http://br.youtube.com/watch?v=UcWpkWBX04E

Source: http://www.lbl.gov/Education/ELSI/pollution-main.html
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