What is the story behind the slogan that smoking is harmful to health?

An old woman. Her husband suffered from lung cancer due to long-term smoking. In the end, he could not be saved in the advanced stage, so he left her forever. Because her husband died of lung cancer caused by long-term smoking, the old lady wanted to warn the world, so she spent 7 years running around and finally got the six words on the cigarette box.

Extended information:

Tobacco leaves contain the poison nicotine, also called nicotine. One gram of nicotine can poison 300 rabbits or 500 mice. If a person is injected with 50 milligrams of nicotine, it will cause death.

Smoking is the most harmful to the respiratory tract and can easily cause laryngitis, tracheitis, emphysema and other diseases. When smoking, smoke enters the mouth, passes through the throat, trachea, bronchi, and enters the blood.

Smoking can cause men to lose their Y chromosome and increase their risk of cancer.

Baidu Encyclopedia-Smoking