Cigarettes are harmful to the human body because they contain nicotine, a toxic substance. When inhaled, nicotine increases the secretion of hormones that constrict blood vessels, leading to vasoconstriction. This impairs blood circulation, reduces oxygen supply, and raises blood pressure. Heavy smoking also accelerates arteriosclerosis and depletes vitamin C levels in the body, speeding up aging.

According to research, each cigarette smoked reduces the body's vitamin C content by 25 milligrams, and smokers have lower vitamin C concentrations than non-smokers. Those who smoke a pack a day see a 25% drop in blood vitamin C levels. Drinking tea, especially green tea, can help replenish vitamin C. Additionally, green tea helps protect blood vessels. Therefore, drinking green tea can, to some extent, reduce the toxic effects of smoking.

It is well known that cigarette smoke contains several carcinogens, such as benzopyrene, which have genotoxic effects on the human body. Green tea extracts can inhibit the formation of carcinogens like benzopyrene and aflatoxin, and suppress abnormalities induced by cigarette smoke extract. Therefore, to protect human health, it is recommended that smokers and passive smokers regularly drink tea, which can help mitigate the harmful effects of tobacco.

Smoking is harmful to health. Quitting smoking should be encouraged. Instead, it is advisable to develop the habit of drinking a cup of green tea when tired, thinking, or writing. Drinking tea not only refreshes the mind and aids concentration but also relieves fatigue. This is because caffeine in tea, once absorbed, stimulates the central nervous system, clears the mind, aids thinking, accelerates blood circulation, and alleviates fatigue, making tea beneficial to human health.