那么吸烟到对青少年的危害到底有多大呢？首先吸烟不仅对发育成长中的青少年

那么吸烟到对青少年的危害到底有多大呢？
首先吸烟不仅对发育成长中的青少年的骨骼发育、神经系统、呼吸系统及生殖系统均有一定程度的影响。并且由于青少年时期各系统和器官的发育尚不完善,功能尚不健全，抵抗力弱进而影响其整体的发育。而烟草中又含有的大量尼古丁对脑神经也有毒害，它会使学生记忆力减退、精神不振、学习成绩下降。调查发现，吸烟学生的学习成绩比不吸烟的学生低。此外，有关资料表明，吸烟年龄越小，对健康的危害越严重，15岁开始吸烟者要比25岁以后才吸烟者死亡率高55%，比不吸烟者高1倍多。
吸烟损害大脑，使智力受到影响。在烟草的烟气中，一氧化碳含量很高。一氧化碳吸入人体后，与血液中的血红蛋白结合成碳氧血红蛋白，使血红蛋白不能正常地与氧结合成氧合血红蛋白，因而失去携氧的功能。由于人的大脑对氧的需要量大，对缺氧十分敏感，因此吸多了烟就会感到精力不集中，甚至出现头痛、头昏现象。久之，大脑就要受到损害，使思维变得迟钝。这样，必然会影响学习和工作，使学生的学习成绩下降。
吸烟还会导致的青少年弱视称为“烟草中毒性弱视”。

結果 (英文) 1:

So how big is the harm of smoking to young people?First smoking not only in the development of young people's bones, nervous system, respiratory and reproductive systems have some degree of influence. And as a teenager every system and organ development is still not perfect, incomplete features, weak immunity system affects its overall development. And tobacco contain a lot of nicotine in the brain is also a poison, which causes memory loss, lack of energy, declining academic performance of students. Survey of smoking students in lower grades than students who do not smoke. In addition, the data indicate that smoking is younger, more serious harm to health, age 15 smokers than smokers 55% higher until after the age of 25, 1 time much higher than nonsmokers.Smoking damages the brain, have impacts on the intelligence. In tobacco smoke, carbon monoxide levels are high. Carbon monoxide inhalation the body, and blood hemoglobin as carboxyhemoglobin, cannot be properly combined with oxygen to the hemoglobin to oxygenated hemoglobin, thus losing function of oxygen. Due to the large volume of the brain's need for oxygen, is sensitive to oxygen, so much smoke and feel distracted and even headaches, dizziness. A long time, brain damage, slow thinking. In this way, will inevitably affect the learning and work, making the academic performance of students declined.Smoking can also lead to amblyopia of teenagers known as "tobacco toxic amblyopia".

結果 (英文) 2:

So smoking on young people to the dangers in the end be?
First Smoking is not only for the development of young people growing bone development, nervous system, respiratory and reproductive systems, they are to a certain extent. And since adolescence various systems and organ development is not perfect, the function is not perfect, weak resistance, thereby affecting their overall development. The tobacco also contains a lot of nicotine on the brain is also poisonous, it will make students memory loss, lack of energy, poor academic performance. The survey found that smoking low student achievement than non-smoking students. In addition, the data indicate that smoking younger, more serious health hazards, before the age of 15 smokers than smokers after the age of 25 with high mortality of 55%, 1 times higher than non-smokers.
Smoking damages the brain, so intelligence is affected. In tobacco smoke, and high levels of carbon monoxide. After carbon monoxide inhaled, and blood hemoglobin to carboxyhemoglobin, hemoglobin can not normally be combined with oxygen to oxyhemoglobin, thus losing oxygen-carrying function. Because the human brain needs a large amount of oxygen, is very sensitive to hypoxia, thus absorbing more smoke you will feel unable to focus, even headache, dizziness phenomenon. A long time, the brain will be damaged, so that thinking becomes dull. This will certainly affect the learning and work, so that students' poor academic performance.
Youth smoking also causes of amblyopia is called "tobacco toxic amblyopia."

結果 (英文) 3:

So how big is the risk of smoking to teenagers?First of all, smoking is not only to the development and growth of young people's skeletal development, nervous system, respiratory system and reproductive system has a certain degree of impact. And due to the development of various systems and organs in the adolescent period is not perfect, the function is not perfect, weak resistance and affect the overall development of its. While a large number of nicotine in tobacco and also contain toxic to the brain, it will make the students' memory, depressed, falling grades. The survey found that smoking students' academic performance was lower than that of non - smokers. In addition, the data show that the younger the age of smoking, the more serious harm to health, 15 years old began to be more than 25 years after the age of smokers mortality rate of 55%, 1 times higher than non-smokers.Smoking damages the brain and causes the brain to be affected. The content of carbon monoxide is very high in tobacco smoke. Carbon monoxide inhalation of the human body, and blood hemoglobin combined with hemoglobin, hemoglobin can not be normal and oxygen synthesis of oxygenated hemoglobin, thus losing the function of carrying oxygen. Because the brain of oxygen demand is big, very sensitive to hypoxia, it will absorb more cigarettes are distracted, headache, dizziness and even. For a long time, the brain will be damaged, so that the mind becomes dull. In this way, it is bound to affect the study and work, so that the students' academic performance.Smoking can also lead to the young people's amblyopia is called "tobacco amblyopia".