A 500-word essay on the dangers of smoking

Introduction: Smoking has many dangers. Everyone should stay away from cigarettes and refuse to smoke. The following is a 500-word essay on the dangers of smoking that I compiled. You are welcome to read and learn from it. Essay 1: The dangers of smoking in 500 words

Everyone knows that smoking is harmful to human beings, but how many people pay attention to it?

According to a new study, smoking a One cigarette can shorten a person's life by 11 minutes. Smoking a pack of 20 cigarettes a day may shorten a person's life by three hours and forty minutes. This estimate is based on a man who started smoking at the age of seventeen and died at an average age of seventy-one. Assuming that he smokes fifteen cigarettes a day, he will consume 311,688 cigarettes in his lifetime. A cigarette. Smokers will die on average six and a half years earlier than non-smokers. This is an astonishing number!

Smoking also has three major hazards

1. It can directly poison and kill lives

Some people have obtained the following amazing results through animal experiments The result: even a large horse cannot withstand 8 injections of nicotine and will die quickly; a lively dog ??can be killed without even a drop of nicotine injected into the vein; in addition, some animals smoke for a long time Finally, an obvious tendency of vasoconstriction or even sclerosis can be found.

2. Can destroy the nutrients of the human body

Smoking can prevent the body from absorbing vitamin C, and nicotine has a direct destructive effect on vitamin C. If the human body is deficient in vitamin C for a long time, there is a possibility of scurvy.

3. It can induce a variety of diseases

Because the smoke inhaled in the body has a malignant irritating effect on the respiratory tract, digestive tract and other organs, some people think it is gastric and duodenal ulcers. , respiratory tract infections and even triggering factors for cancers of the mouth, lips, tongue, esophagus, respiratory tract, etc.

From this point of view, smoking is harmful to human health but not beneficial. Therefore, we should try our best to quit smoking or smoke less. It is best for non-smokers not to get into this habit. Essay 2: The dangers of smoking, 500 words

Long-term smoking is equivalent to chronic suicide. About 2.5 million people die from smoking every year. Why is smoking so harmful?

Cigarettes contain a chemical called nicotine. It can pass through the bronchial mucosa of the person's mouth, nose, and is easily absorbed by the body. Nicotine stuck to the surface of the skin can also be absorbed and penetrated into the body. The nicotine contained in one cigarette can poison a mouse, and the nicotine in 20 cigarettes can poison a cow. The lethal dose for humans is 50 to 70 mg, which is equivalent to the nicotine content of 20 to 25 cigarettes. If nicotine from one cigar or three cigarettes is injected into a person's veins, death will occur within 3 to 5 minutes. Long-term smokers are 8 times more likely to develop lung cancer than non-smokers, and 10 times more likely to develop throat cancer than non-smokers. In addition, smoking can also cause heart disease, esophageal cancer and many other diseases. According to statistics from a certain hospital, 87% of lung cancer patients are caused by smoking. It can be seen that smoking is very harmful to human health.

Passive smoking is more harmful than smokers. It is especially harmful to children. The smoke exhaled by smokers contains a lot of harmful substances: benzene, tar, formaldehyde, nicotine. The ancients said: "Poisonous snakes do not bite smokers" because they smell the bitter smell emitted by smoking and fly away. . Children from smoking families are five times more likely to develop lung cancer than children from non-smoking families. According to a newspaper report, three children in a family died from passive smoking due to long-term smoking by their parents. What a painful lesson!

The harm of smoking is very great. For the health of you and others, please do not smoke! Essay 3: The harm of smoking in 500 words

Currently, the number of people smoking The phenomenon can be seen everywhere. Some people regard cigarettes as our children's daily snacks, some people have turned from smoking to drug abuse, and some people have been deprived of their lives because of smoking. Although cigarette packages are marked with "Smoking is harmful to health", people who smoke turn a blind eye and ignore it.

People who smoke, do you know how harmful smoking is? Tobacco contains a large number of toxic substances. The smoke produced when burning cigarettes contains about a thousand ingredients that are harmful to the human body. , among which nicotine is the most harmful. One cigarette contains enough nicotine to poison a mouse. Smoking is also prone to various diseases, such as lung cancer, gastric cancer, esophageal cancer, emphysema, etc. According to information provided by the World Health Organization, approximately 2.5 million people in the world die from diseases caused by smoking every year. In other words, one person is killed by tobacco every 13 seconds. What an astonishing number!

Smoking not only harms your own health, but also makes people around you second-hand smokers. Smoke-infected people have to "passive smoking" and harm the health of others. This is also a very uncivilized and immoral behavior.

If smoking is a "chronic suicide" for adults, then it is even more harmful to young people. After teenagers and children smoke, they will suddenly experience dizziness, unsteadiness on their feet, cough, phlegm and other symptoms that are more common. Since the poisonous effects of tobacco on people are not all manifested at once, the potential danger is even greater.

I appeal to people who smoke, don’t let tobacco deprive you of your precious life, give up smoking, quit smoking!