The production method is to dry tobacco and shred it, and then grow it into a barrel-shaped strip with a diameter of 120mm in a paper roll. When smoking, one end is lit, and then the smoke is breathed through the mouth at the other end. Tobacco is a plant native to South America, and its leaves can be used to chew or make cigarettes for smoking. The earliest users of tobacco were American Indian reds.

When European explorers arrived in the New World, the use of tobacco was quite common in the United States. /kloc-In the 6th century, tobacco was introduced to Europe and then spread all over the world. Before the 20th century, tobacco was mainly used in the form of chewing, sniffing, pipe and cigar. /kloc-at the end of 0/9 century, cigarettes became the main form of tobacco use due to the invention of machines for making cigarettes.

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The main components of cigarettes:

Although the chemical substances in cigarettes are mainly dry tobacco, many additives have been added after chemical treatment. The smoke from burning cigarettes contains about 4,000 chemicals, many of which are toxic, causing abnormal substances and thousands of carcinogens.

Radioisotopes are one of the causes of lung cancer in smokers. Cigarette polonium 2 10 cannot be excreted. It can enter blood vessels and cause pathological changes in the heart, liver and stomach. Cigarettes also contain radium 226 and lead 2 10. Radioisotopes come from mineral fertilizers. It has been found that smokers in the sixties and eighties have radioactive isotopes in their bodies. The smoke from burning cigarettes also contains carcinogens such as nitrosamines and benzopyrene.

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