Smoking is a greater cause of death and disability than any single disease, says the World Health Organisation、 According to their figures, it is responsible for approximately five million deaths worldwide every year、 Tobacco smoking is a known or probable cause of approximately 25 diseases, and even the WHO says that its impact on world health is not fully assessed、 Heart attack and stroke UK studies show that smokers in their 30s and 40s are five times more likely to have a heart attack than non-smokers、 Tobacco contributes to the hardening of the arteries, which can then become blocked and starve the heart of bloodflow, causing the attack、 Often, smokers who develop this will require complex and risky heart bypass surgery、 If you smoke for a lifetime, there is a 50% chance that your eventual death will be smoking-related - half of all these deaths will be in middle age、 Smoking also increases the risk of having a stroke、 Lung problems Another primary health risk associated with smoking are lung cancer, which kills more than 20,000 people in the UK every year、 US studies have shown that men who smoke increase their chances of dying from the disease by more than 22 times、 Women who smoke increase this risk by nearly 12 times、 Lung cancer is a difficult cancer to treat - long term survival rates are poor、 Smoking also increases the risk of oral, uterine, liver, kidney, bladder, stomach, and cervical cancers, and leukaemia、 Another health problem associated with tobacco is emphysema, which, when combined with chronic bronchitis, produces chronic obstructive pulmonary disease、 The lung damage which causes emphysema is irreversible, and makes it extremely difficult to breathe、 Harm to children Smoking in pregnancy greatly increases the risk of miscarriage, is associated with lower birthweight babies, and inhibited child development、 Smoking by parents following the birth is linked to sudden infant death syndrome, or cot death, and higher rates of infant respiratory illness, such as bronchitis, colds, and pneumonia、 Nicotine, an ingredient of tobacco, is listed as an addictive substance by the US authorities、 Although the health risks of smoking are culmulative, giving up can yield health benefits regardless of the age of the patient, or the length of time they have been smoking、 Future impact By 2020, the WHO expects the worldwide death toll to reach 10 million, causing 17、7% of all deaths in developed countries、 There are believed to be 1、1 billion smokers in the world, 800 million of them in developing countries、

With the developing rises live, people directs more and more excessively on environment, especially in a fewmiddle-schools、 It would destroy nature if we Wastes excessive balance、Protect the environment is the duty of everyone, we are just some students , we couldn't make something especially big contribution for the environment , but we can secondary composes up in our environment , from protecting schools' environment, for example: Observe in connection with the regulation forbidding chaos to throw away various waste , avoid using the drink cup , mess tin , plastic bag for one time merely , use paper box to wait in the place or container throwing away waste to appointment, replace, such can cut down a rubbish greatly, lightening refuse disposal job pressure , treasuring flowers and plants trees , being the cleaning giving to New Year card as a gift , keeping campus short and so on、Although these being minor matter at above ,but if everybody gets to do, set about from saving resource and falling off contaminating, self life-style adjusting an once, we are therefore likely to be to protect the earth making a contribution out、 As the teen-agers who taking knowledge now , we should protection environment up right now、Save the resource, protection environment , act as the young host who protects the earth好纳

烟草被视为世界上危害最严重的社会问题之一，当前全世界烟民已达12亿，每年因吸烟导致疾病死亡者约300万。

在我国有3、5亿吸烟者，其中未成年人吸烟比率呈逐年上升趋势。

据卫生部门近年来所作的抽样调查发现，在大学、高中和初中男生中，吸烟的比率分别高达46％、45％和34％,形势是异常严峻的。

当孩子还未成年时，家长有责任关心孩子的健康，制止孩子的不良行为，积极引导他们健康发展。

研究证明，10岁以下的儿童对烟普遍反感，认为吸烟又呛又难闻，11-13岁的儿童，才逐渐对吸烟产生好奇心，跃跃欲试，15岁以后则开始把吸烟作为自己长大成人的标志，由此可见，11－15岁是中小学生有可能染上吸烟嗜好的危险年龄。

家长和老师首先应做到自己不抽烟，有了吸烟嗜好应戒烟，作孩子的表率；并且应对孩子讲解吸烟的危害，让孩子了解什么才叫行为美，因为这个时期是孩子能否养成良好行为习惯的关键时期。

世界上许多国家在制定吸烟干预计划时，都把对青少年进行反吸烟教育作为重点，我国也制定了控制吸烟--从青少年抓起的政策，因为降低了青少年的吸烟率，也就意味着降低了今后成人的吸烟率。

世界上很多国家都通过立法，禁止向18岁以下的未成年人出售香烟，否则将对销售者课以数额较大的罚款。

我国《预防未成年人犯罪法》第十五条明确规定：未成年人的父母或者其他监护人和学校应当教育未成年人不得吸烟。

任何经营场所不得向未成年人出售香烟。

吸烟对发育成长中的青少年的健康危害很大，对骨骼发育、神经系统、呼吸系统及生殖系统均有一定程度的影响。

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，与成人相比吸烟的危害就更大。

此外，由于青少年呼吸道比成人狭窄，呼吸道粘膜纤毛发育也不健全，因此吸烟会使呼吸道受损害并产生炎症，增加呼吸的阻力，使肺活量下降，影响青少年胸廓的发育，进而影响其整体的发育。

烟草中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，青少年正处在性发育的关键时期，吸烟使睾丸酮分泌下降20％－30％，使精子减少和畸形；使少女初潮期推迟，经期紊乱。

青少年吸烟还会使冠心病、高血压病和肿瘤的发病年龄提前。

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。

上述专家们关于吸烟危害青少年健康的研究、调查和呼吁，并非耸人听闻，一位16岁少年因吸烟导致癌症的故事，就是一个深刻的例证： 1998年，中国医科院肿瘤医院胸外科和麻醉科联手，及时、成功地为一位少年开胸取出肿瘤并重建隆突。

隆突在人的气管与左右支气管交界的三岔路口处，是呼吸的交通要道，因此必须保持通畅。

南方某城市16岁的中学生毕某的隆突上长了一个肿瘤。

半年前，他就已出现症状，可惜被当地医院误诊，一直按感冒治疗。

经中国医科院肿瘤医院胸外科和麻醉科医生认真检查，发现肿瘤已将患者左侧支气管堵严，右侧支气管也只剩下一很小的缝隙。

手术难度很大，保证手术安全的麻醉尤其困难。

尽管肿瘤医院做过数十例医隆突手术，对这种手术的麻醉颇具经验，但毕竟患者年龄小，瘤子大，病情重，手术风险很大，如不及时手术，孩子很快就会被憋死。

医生们精心设计的治疗方案和娴熟的医疗技术，使少年又获得了新生。

小小年纪的中学生怎么会得这种要命的病呢

原来，他是个烟民，吸烟史已有两年多，从偷吸到公开吸，直到一个月需要吸3条香烟。

据肿瘤专家介绍，吸烟时，烟雾大部分经气管、支气管进入肺里，小部分随唾液进入消化道。

烟中有害物质部分留在肺里，部分进入血液循环，流向全身。

在致癌物和促癌物协同作用下，正常细胞受到损伤，变成癌细胞。

年龄越小，人体细胞对致癌物越敏感，吸烟危害越大。

这位少年之所以患癌，是他过早、过多吸烟与其他促癌因素协同作用的结果。

如今，死里逃生的他不仅表示再也不吸烟了，而且准备劝说他的同学、朋友也赶快戒烟。

我的爷爷是个老烟迷，从我记事到现在，几乎每次见他，他都在吸着烟。

所以，在我的印象里，那个佝偻者身体，皮肤黝黑，满头白发，微微颤抖的食指和中指夹着一根香烟，时不时从口中吐出一团白气的老人，就是我的爷爷。

“爷爷是不是在吃什么好东西

”我常常看着他，发着呆在想。

终于，在强烈的好奇心的驱使下，我将我的疑问告诉了他。

爷爷却认认真真的和我说：“这不是个好东西，这是毒药

它会用短暂的快意来偷走你的生命

”我听后忙喊道：“爷爷，那你别抽了。

”爷爷却无奈的摇了摇头说：“唉，戒不掉了，孩子，你以后可千万不能碰这个东西，不然你也会和我一样。

”说着便咧开嘴，露出昏黄的牙齿对我笑着。

吸烟有害健康，我们要珍爱生命，远离毒品