Tobacco leaves contain toxic nicotine, also called nicotine. 1 g nicotine can poison 300 rabbits or 500 mice. If people are injected with 50 milligrams of nicotine, they will die. Smoking is the most harmful to the respiratory tract, and it is easy to cause laryngitis, bronchitis, emphysema and other diseases.

The harm of smoking

Among the eight fatal diseases in the world, six diseases are related to smoking, namely ischemic heart disease, cerebrovascular disease, lower respiratory tract infection, chronic obstructive pulmonary disease, tuberculosis and lung cancer.

Smoking may cause tumors of lung, larynx, kidney, stomach, bladder, colon, mouth and esophagus, and other diseases, such as chronic obstructive pulmonary disease, ischemic heart disease, stroke, abortion, premature delivery, birth defects, impotence and so on.