In daily life, many people smoke, drink, drink tea is not separate, these three compared to smoking is more harmful, moderate drinking may have certain benefits, and drinking tea in most cases is also beneficial to physical and mental health of a thing. But it should also be noted that although drinking may have certain benefits, but the harm caused by excessive drinking should not be ignored. In addition, drinking tea may seem simple, but the way you drink it is very important, moderate drinking is good for your health, wrong drinking will have some impact on your health. One, smoking: harm to people and harm themselves According to the determination, cigarettes in the burning, smoke contains more than 3,000 toxic chemicals, the most serious harm to the human body is nicotine, smoke tar and carbon monoxide. The tar produced by the burning of tobacco is a carcinogenic and carcinogenic substances, inhaled into the body will increase the risk of many types of cancer, such as lung cancer, stomach cancer and oral cancer. Nicotine and carbon monoxide in tobacco smoke is one of the main risk factors for coronary atherosclerosis, and regular smoking can lead to coronary heart disease, angina pectoris, myocardial infarction, cerebrovascular sclerosis and other cardiovascular diseases; long-term smoking may also lead to chronic bronchitis, emphysema, inflammation of the digestive tract and peptic ulcers. The nicotine in tobacco also affects the secretion of sex hormones, which in turn affects sperm production, and in serious cases can lead to male infertility. The carcinogenic substances in tobacco can also affect the fetus through the placenta, resulting in fetal developmental delays, deformities, and even death. It should be noted that second-hand smoke and third-hand smoke brings harm should not be underestimated, often passive smoking people, unconscious inhalation of smoke dust particles and harmful substances, will also cause adverse effects on the body, and will not be less than the harm of first-hand smoke. Second, drinking: a small drink is pleasant, the amount of harm to the body wine is the main component of ethanol, moderate drinking has a stimulating effect on the body, so that vasodilation, blood circulation accelerated, mental stimulation, good health. But long-term drinking can cause chronic alcoholism, nutritional deficiencies, pancreatitis, esophagitis, gastric and duodenal ulcers and even fatty liver, chronic alcoholic hepatitis, liver cirrhosis, liver cancer, etc. In addition, drinking alcohol, especially strong alcohol can increase the heart rate and blood pressure, and long-term heavy drinking can even cause heart enlargement and decreased myocardial contraction function. Excessive drinking may also cause acute alcohol poisoning, serious cases can be life-threatening. Third, drink tea: the right tea, reduce the harm of the right tea does have certain benefits to the body, help refresh the brain, enhance brain excitability. Caffeine and vitamins in tea can promote gastric secretion, help digest food and prevent fat accumulation to a certain extent; tea polyphenols in tea has the effect of antioxidant, proper drinking tea helps to remove free radicals in the body. However, incorrect drinking tea not only can not play the benefits of tea, but will bring some harm. 1, excessive or drink strong tea: excessive tea, drink strong tea is likely to cause excessive excitability, insomnia, tachycardia and other performance; 2, improper time to drink tea: drinking tea on an empty stomach is easy to make the intestines absorb too much caffeine, which may produce panic, dizziness, weakness and other performance, especially for patients suffering from digestive system Patients with digestive system diseases, long-term fasting tea will stimulate the gastric mucosa, causing damage, and in serious cases can induce gastric cancer. In addition, drinking tea immediately after meals will hinder the absorption of nutrients, which will cause malnutrition in the long run; 3, drinking tea at too high a temperature: too hot tea will repeatedly stimulate the mouth, esophagus, may damage the local mucosa, in the long run, can increase the risk of oral cancer, esophageal cancer, etc.; 4, drinking tea during illness or medication: for patients suffering from hyperthyroidism, peptic ulcers, iron deficiency anemia, or severe coronary heart disease For patients suffering from diseases such as hyperthyroidism, peptic ulcer, iron deficiency anemia, or severe coronary heart disease, hypertension, etc., drinking tea is likely to aggravate the original disease and harm the body. In addition, for patients who are taking medication, especially sedative drugs, anti-arrhythmic drugs, analgesic drugs and other patients, drinking tea can easily prevent the absorption of drugs, affecting the effectiveness of the drug. In summary, smoking is undoubtedly the most harmful to the body, it is also recommended to drink as little as possible, if drinking tea properly and in the right way, there are certain benefits to human health. Therefore, for the sake of their own health and the health of others, be sure to stay away from smoking and alcohol, while learning to drink tea correctly.