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建立人际资源圈Smoking_And_Its_Effects
2013-11-13 来源: 类别: 更多范文
Smoking And Its Effects
Smoking and its Effects
Humans are the only species that have the "urge" to inhale harmful smoke into their body. There are all type of smokers. Some smokers are casual smokers, who only smoke in a social scene other types of smokers who are depressed or stressed because they feel that it relieves something in them, and finally there are addictive smokers, who don't know why they even started but they can't stop. What these people don't realize is that the harm they are putting their bodies through. There are many risks of smoking like lung disease, heart disease, and risks in pregnancy to the unborn child. Today it is known that cigarette smoking is the leading cause of lung cancer and death in the United States. One researcher has described cigarette smoking as causing "a chronic inflammatory disorder of the lower airways."(Doll 901-911)
When we breathe, air enters the upper airway through the nose and mouth where the air is filtered. The inhaled air travels though the trachea to the lungs. Inside the lung there is a main stem called the bronchus and little air sacs called bronchioles. Oxygen is exchanged for carbon dioxide in the blood. The blood then
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