Smoke has something for people in poor health, nicotine.
Nicotine in a cigarette can kill a mouse, 25 g of nicotine in cigarettes can kill a few cows, 40 to 60 mg of pure nicotine can kill a person.
The dangers of nicotine is also quite big, it can cause stomach or other stomach disease; Also can make the person causes heart disease cause rhythm of the heart is not straight; The outbreak of serious still can cause cancer.
Cigarettes are hidden in the invisible killer, around us are all should be vigilant.
According to scientists, the chemical composition of tobacco contains hundreds of complex, most harmful to human body, including tar, nicotine, phenols, alcohols, acids, aldehyde is 40 kinds of toxic and carcinogenic substance. Smoke after the fire, smoke, contains the chemical composition of tobacco in all, at the same time than the tobacco itself and added some harmful substances, such as carbon monoxide, tobacco tar and so on. This is because in addition to the tobacco itself, in the process of cigarette made, to add some cocoa in raw materials, liquorice, sugar, glycerin, such as ethylene glycol, moist, taste fragrance and combustion-supporting material. Although these additive itself is harmless, but changed in the process of combustion. For example, in the back of the rat with cocoa after burning smoke oil, can grow skin tumor. Glycyrrhizic acid in glycyrrhiza after burning, with other ingredients, can generate have carcinogenic polycyclic aromatic hydrocarbons. Sugar increased after combustion with tobacco tar, and the product of sugar after combustion is an important carcinogens in tobacco. Glycerin and glycol after the burning of the material, not only can make smokers bladder cancer, and the acrolein inhibits the trachea and cilia secretion from the lungs, thereby increase the chances of suffering from bronchitis and emphysema, and make people with both became seriously ill.
Smoke harm to people is how great! So we can't smoke. Stop smoking, the benefit of future generations.
煙里有一種對人身體不好的東西——尼古丁。
一枝香菸中的尼古丁可以毒死一隻小白鼠，25g的香菸里的尼古丁可 毒死幾頭牛，40至60毫克純尼古丁可以毒死一個人。
尼古丁的危害也是相當的大，它可以引起胃痛或其它胃病;還會使人引起心律不正誘發心臟病;嚴重的還可能引起癌症的爆發。
香菸是隱藏在我們身邊的隱形殺手，是大家所應警惕的。
據科學家測定，菸草中含有數百種複雜的化學成分，大部分對人體有害，其中焦油、尼古丁、酚類、醇類、酸類、醛類等40種是有毒和有致癌作用的物質。煙在點燃後，所產生的煙霧，包含了菸草中所有的化學成分，同時比菸草本身又增加了一些有害物質，如一氧化碳和煙焦油等。這是因為除菸草本身外，在製成捲菸的過程中，要在原料中加入一些可可、甘草、糖、甘油、乙二醇等調味、濕潤、產香、助燃物質。這些添加劑雖然本身無害，但在燃燒過程中卻起了變化。例如，在鼠背塗上可可燃燒後產生的煙油，可長出皮膚瘤。甘草中的甘草酸在燃燒後，與其他成分化合，可生成有致癌作用的多環芳烴。糖與菸草一起燃燒後增加了焦油量，而糖燃燒後的產物是煙中的一個重要致癌物。甘油和乙二醇在燃燒後的物質，不但可能使吸菸者患膀胱癌，而且所產生的丙烯醛可抑制氣管和纖毛分泌物從肺內排出，從而增加患氣管炎和肺氣腫的機會，並使患有這兩種病的人病情加重。
煙對人的危害是多么大啊!所以我們不能吸菸。杜絕吸菸，造福後人。