第一篇:吸烟的危害 英语作文
Smoking is harmful
When you are in public places, you will see many smokers.In China the number of smokers is as many as 350 million.Why do so many people enjoy smoking? Some think it is a pleasure and some believe it is refreshing.In fact, smoking is a bad habit.It does great harm to our health, not only to the smoker himself, but also to others around him.For smokers, it is a great waste of money, and causes all kinds of diseases.Besides,many fires are caused by careless smokers.Today, more and more people are beginning to realize the harm of smoking and decideto give up.If you are not a smoker, don’t start.
第二篇:英语作文:吸烟的危害
Harm Of Cigarette As is known to all,smoking will do harm to people。But why do some People still smoke While knowing it harmful?Or Why giving up smoking is so Difficult?Cigarette Contains 2.5~2.8mg Nicotine,it is very terrible,even can kill a mouse。Some resistant People won't be dead within short amount,but those weak Crowd cannot afford。In addition,Cigarette will also cause some diseases,such as cancer,pneumonia and so on。If we still don't take measures to stop smoking,more and more People will die from it。
2.Health(By Kaiser3344)Health is far more important than wealth and wisdom.Good health enables us to enjoy our life and achieve what we hope for in our career.To keep healthy,we should have a balanced diet.For the purpose of health,we should live in a comfortable house.To make life happy and health,we should make more friends 3.smoking is very harmful to our health.It does great harm not only to our health,but also to our mind, especially for us teenagers.Now more and more people all over the world have given up smoking or have made up their minds to do so, I think we middle school students are the future builders of our country.We should study hard and make progress every day.We should form good habits so that we can spend our time learning things useful and valuable for our motherland and people, I think today's class meeting is very meaningful to my classmates who have a bad habit of smoking.4.Today smoking is a widespread habit all over the world.Not only the old, the youth, but also middle school students have been engaged in smoking.Many of them think that smoking is a smart symbol.However, smoking is harmful to one’s health.It contributes a lot of lung cancer, from which many people have died in the past years.It can also cause many other diseases.In a word, if you smoke, you do have a much greater chance of losing your health.Furthermore, scientific research shows that smoking is not only harmful to smokers themselves, but also a threat to public health, especially to women and children.Therefore, many countries have made laws forbidding smokers to smoke m public places such as cinemas, stations, hospitals, and so on Give up smoking!If you don't smoke, don't start.Give up smoking for the sake of your health, for the sake of your family, and for the sake of the whole world.6.Tobacco smoke is killing thousands of people every year and injuring hundreds of thousands more every day like children.Federal officials released a massive report that is sparking renewed efforts to ban smoking in public places.Secondhand smoke has been classified as known carcinogen, this classification is only shared by ten other pollutants.(These pollutants include benzene, asbestos and smoke inhaled directly from cigarettes.Govenor Mario Cuomo has asked the Legislature to outlaw smoking on school grounds and antismoking advocates said they would target airlines and fast food chains for similar bans.The risk of developing lung cancer due to tobacco smoke is 1 in 1,000 for nonsmokers and 2 in 1,000 for nonsmoking spouses of smokers.However, the risk for smokers is 70 in every 1,000.Passive smoking causes between 150,000 and 300,000 cases of bronchitis, pneumoia and similar infections in children less than 18 months old and worsens the condition of between 200,000 and 1 million asthmatic children.It is pointless to allow people to smoke in one part of a restaurant and not to allow it in another when eventuallly the nonsmoking section breathes in the smoke.In conclusion, second hand smoke is a human carcinogen that kills about 3,000 U.S.nonsmokers because of lung cancer annually.Cigarette smoke is responsible ffor 150,000 to 300,000 cases of bronchitis and pneumonia and other lower respiratory infections in children up to 18 months of age.Tobacco smoke is also known to cause the build-up of fluid in the middle ear causing various infections.As one can see it is not recommended for people to smoke in public due to the effects it has on smokersa s as well as nonsmokers.it has been estimated that smokers have made up half of the population in china.and the smokers are becoming younger and younger, even ineluding some middle school students.nowadays more and more people have realized smoking can do harm to people'shealth.however, some people still enjoy smoking.why? because some of them think it is a kind of fashion, some think it is of great fun and others, think that smoking can refresh themselves.in fact, smoking is a bad habit.it can cause a lot of diseases.meanwhile smoking is a waste of money.besides, careless smokers may cause dangerous fires.smoking is harmful and it is not only bad for smokers themselves, but also bad for non-smokers.therefore, i hope all the smokers can give up smoking for themselves and also for the people around them.it is said that there are about half of people in china are smoking.many young boys and girls have the habit of smoking, though they are middle school students.as we all know, smoking does great harm to human beings.more and more people have come to realize how serious this problem is.but they are never bored with it.some people think it is a kind of fashion, some think it is of great fun and others think that smoking can refresh themselves.smoking causes many illnesses.a lot of people always cough because of smoking.the most serious illness caused by smoking is lung cancer.meanwhile smoking is a waste of money.besides, careless smokers may cause dangerous fires.in order to keep healthy, we should get rid of the bad habit of smoking.please stop smoking at once.
第三篇:吸烟危害
吸烟危害
烟草的烟雾中至少含有三种危险的化学物质:焦油,尼古丁和一氧化碳,焦油是由好几种物质混合成的物质,在肺中会浓缩成一种粘性物质。尼古丁是一种会使人成瘾的药物,由肺部吸收,主要是对神经系统发生作用。一氧化碳能减低红血球将氧输送到全身去能力。
一个每天吸15到20支香烟的人,其易患肺癌,口腔癌或喉癌致死的机率,要比不吸烟的人大14倍;其易患食道癌致死的机纺比不吸烟的人大4倍;死于膀胱癌的机率要大两倍;死于心脏病的机率也要大两倍。吸香烟是导致慢性支气管炎和肺气肿的主要原因,而慢性肺部疾病本身,也增加了得肺炎及心脏病的危险,并且吸烟也增加了高血压的危险。
各器官的危害:
口腔及喉部
烟的烟雾(特别是其中所含的焦油)是致癌物质————就是说,它能在它所接触到的组织中产生癌,因此,吸烟者呼吸道的任何部位(包括口腔和咽喉)都有发生癌的可能。
心脏与动脉
尼古丁能使心跳加快,血压升高,烟草的烟雾可能是由于含一氧化碳之故,似乎能够促使动脉粥样化累积,而这种情形是造成许多心脏疾病的一个原因,大量吸烟的人,心脏病发作时,其致死的机率比不吸烟者大很多。
食道
大多数吸烟者喜欢将一定量的烟教养吞下,因此消化道(特别是食道及咽部)就有患癌疾的危险。
肺
肺中排列于气道上的细毛,通常会氢外来物从肺组织上排除。这些绒毛会连续将肺中的微粒扫入痰或粘液中,将其排出来,烟草烟雾中的化学物质除了会致癌,还会逐渐破坏一些绒毛,使粘液分泌增加,于是肺部发生慢性疾病,容易感染支气管炎。明显地,“吸烟者咳嗽”是由于肺部清洁的机械效能受到了损害,于是痰量增加了。
膀胱
膀胱癌可能是由于吸入焦油中所含的致癌化学物质所造成,这些化学物质被血液所吸收,然后经由尿中样出来。
烟草的烟雾中至少含有三种危险的化学物质:焦油,尼古丁和一氧化碳,焦油是由好几种物质混合成的物质,在肺中会浓缩成一种粘性物质。尼古丁是一种会使人成瘾的药物,由肺部吸收,主要是对神经系统发生作用。一氧化碳能减低红血球将氧输送到全身去能力。
第四篇:吸烟的危害
五(3)班健康教育演讲稿
同学们,老师们,大家好,今天健康教育主题是《远离香烟,健康生活》。
同学们,你们知道5月31日是什么日子吗?是世界无烟日。同学们,你知道吸烟对人体的危害吗?大量的科学研究证明,吸烟对人体健康的危害十分广泛。所有烟草中都含有可导致人体发生多种致死性和致残性毒素;吸烟者还容易患癌症。
既然烟草有如此可怕的危害,为什么有众多的人吸烟呢?原因主要有两个:一是烟草中所含的尼古丁令人上瘾,使人对它产生依赖,不容易戒掉;另一个原因是大多数人还没有把吸烟看成是既害人又害己的行为,相反,认为这是一件很有派头,很潇洒的事情。
对青少年来说,吸烟的危害不仅会导致很多疾病,还会影响骨骼生长发育,甚至可以导致早衰,早亡,吸烟还可能使青少年养成不良的生活习惯,诱发不良行为,甚至引发犯罪。反吸烟已成为我国迫在眉睫的当务之急。为了下一代的健康成长,我们要大声呐喊:不要让烟雾笼罩我们!
第五篇:吸烟的危害
青少年吸烟的危害:
1、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。
2、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。
3、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。
4、吸烟导致的青少年弱视称为“烟草中毒性弱视”。其主要表现一是视力障碍:视物不清,戴眼镜也难以矫正,随着视力减退逐渐加重,到一定时期,连视力表上0.1也看不清楚;二是视野改变:早期视野中间出现一团哑铃形或圆形黑影,后期视野缩小,视物时四周模糊不清;三是色觉导常:尤其是辨不清红、绿颜色;四是畏光:在强光下视物反而不清楚。烟草中毒性弱视病情发展比较缓慢,很容易被人们忽视。
吸烟对人的健康有一定危害,对青少年来说,危害性就更大了。
医学专家的研究报告说,青少年正处在生长发育时期,各生理系统、器官都尚未成熟,其对外界环境的有害因素的抵抗力较成人弱,易于吸收毒物,损害身体的正常生长。据美国25个州的调查,吸烟开始年龄与肺癌死亡率呈负相关,若将不吸烟者肺癌死亡率定为1.00%时,15~19岁开始吸烟者为19.68%,20~24岁为10.08%,25岁以上为4.08%。说明吸烟开始年龄越早,肺癌发生率与死亡率越高。平均来看,若吸烟者从青少年时开始吸烟,并持续下去,就会有50%的机会死于与烟草相关的疾病。其中半数将死于中年,或70岁之前,损失大约22年的正常期望寿命。由于长期吸烟,从青年时期开始的任何年龄段的吸烟者都比不吸烟者的死亡率高约3倍。
第二,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。
对未成年人来讲,烟草中的尼古丁是一种神经毒素,主要侵害人的神经系统。一些青少年在主观上感觉吸烟可以解除疲劳、振作精神等,这是神经系统的一次性兴奋。实际上是尼古丁引起的欣快感是短暂的,兴奋后的神经系统出现抑制。所以,吸烟后神经肌肉反应的灵敏度和精确度均下降。国外一心理研究机构的一项研究结果表明,吸烟者的智力比不吸烟者降低。
比尤利等人调查了英国两个地区14033个10~12岁半的儿童呼吸道症状流行情况与吸烟的关系,结果是:吸烟的男孩与不吸烟的相比,早晨咳嗽的是17.4%对6.4%,白天和夜间咳嗽的是41.4%对20.5%,连续咳嗽3个月的是14.5%对4.8%。
一份医学报告说,吸烟易使青少年感染致病细菌,吸烟者感染脑膜炎、毒血症、肺炎和耳病的几率比不吸烟者高4倍多。专家们说,吸烟越多,感染这些病菌的可能性越大。美国每年有50万人因感染这种病菌而患病,每年有4万多人死亡,这种病菌也是造成儿童死亡的原因之一。
吸烟导致的青少年弱视称为“烟草中毒性弱视”。其主要表现一是视力障碍:视物不清,戴眼镜也难以矫正,随着视力减退逐渐加重,到一定时期,连视力表上0.1也看不清楚;二是视野改变:早期视野中间出现一团哑铃形或圆形黑影,后期视野缩小,视物时四周模糊不清;三是色觉导常:尤其是辨不清红、绿颜色;四是畏光:在强光下视物反而不清楚。烟草中毒性弱视病情发展比较缓慢,很容易被人们忽视,晚期严重时可能造成失明。
吸烟的危害很多,这已是公认的。世界卫生组织192个成员已在2003年5月31日一致签署了一个为全球减少烟草使用、降低烟草危害和死亡的世界性公约,中国将从这个公约中获益匪浅。在中国,有63%的男性吸烟,占全球10亿烟民的1/3,中国因此成为世界最大卷烟市场。吸烟的害处很多,它不但吞噬吸烟者的健康和生命,还会污染空气,危害别人。这要从六个方面讲:
(一)、肺部疾病。香烟燃烧时释放4000多种化学物质,其中有害成分主要有焦油、一氧化碳、尼古丁和刺激性烟雾。焦油对口腔、喉部、气管、肺部均有损害。正常人肺中排列在气道上的绒毛通常会把外来物从肺组织上排除,这些绒毛会将微粒扫入痰和粘液中排出。烟草的烟雾中焦油沉积在绒毛上,破坏了绒毛的功能,使痰增加,使支气管发生慢性病变,气管炎、肺气肿、肺心病、肺癌便会产生。据统计吸烟的人60岁以后患肺部疾病的比例为47%,而不吸烟的人60岁以后患肺部疾病的比例仅为4%,这是一个触目惊心的数字。
(二)、心血管疾病。香烟中的一氧化碳使血液中的氧气含量减少,造成相关的高血压等疾病,吸烟使冠状动脉血管收缩,使供血量减少或阻塞,造成心肌梗塞。吸烟可使肾上 腺素分泌增加,引起心跳加快,心脏负荷加重,影响血液循环而导致高血压、心脏病、中风等。
(三)、吸烟致癌。吸烟可引起癌症,据统计,吸烟与口腔癌、鼻烟癌、肺癌、胃癌、肠癌、膀胱癌、乳腺癌等有关。为什么致癌大家可能知道甚少,了解吸烟致癌的机理对于帮助人们尽早戒烟大有好处。烟毒溶于水和食物中直接破坏DNA,引起基因突变。烟草中含有较多的放射元素,这些放射元素随着烟雾流入体内,损伤组织细胞,假如每天吸30支烟,X射线产生的毒素可相当于拍100次X光片所积累的剂量,这种射线会引起基因突变致癌。吸烟还损伤人的免疫功能,为什么吸烟的人容易感冒,是因为人体的淋巴细胞象卫兵一样保卫人体不受侵害,而吸烟会导致淋巴细胞活性降低,导致癌症。所以鉴于吸烟致癌的三大因素,戒烟要越早越好。
(四)、吸烟还会导致骨质疏松,更年期提早来临。吸烟可使男性丧失性功能和生育能力。孕妇吸烟可导致胎儿早产及体重不足、流产机率增高。吸烟使牙齿变黄,容易口臭。吸烟害人害己,被动吸烟的人的危害是吸烟人的两倍,为了你和家人的健康,不让自己成为烟的奴隶,应尽早戒烟。
(五)、吸烟对智力的危害。吸烟使人的注意力受到影响,有的人认为吸烟可以提神、消除疲劳、触发灵感,这都是毫无科学道理的。实验证明,吸烟严重影响人的智力、记忆力,从而降低工作和学习的效率。心理学家还以200名大学生的学习成绩作为实验指标,结果发现吸烟的学生成绩比不吸烟的学生平均差7分。为什么会出现这种情况呢?因为香烟中尼古丁进入体内刺激植物神经系统,引起血管痉挛,影响大脑皮层的神经活动,使人的智力减退。
(六)、吸烟是有百害而无一利,中国53%的儿童被动吸烟,被动吸烟的危害是吸烟人的两倍,并且对儿童危害更大,容易患肺炎、支气管炎、重症哮喘和其它疾病。如果目前吸烟的情况持续下去,对儿童的智力发育、对吸烟者的家庭以及对个人都会付出极大的代价。