Why should the cigarette case say that smoking is harmful to health?

According to the WHO Framework Convention on Tobacco Control, Article 7-Non-price measures to reduce tobacco demand-mentions that every box and unit package of tobacco products, as well as any outer packaging and labels of such products, have health warnings explaining the harmful consequences of smoking and may include other appropriate information.

The packaging and labels of tobacco products shall not publicize tobacco products in any false, misleading, deceptive or possibly false impression on their characteristics, health effects, hazards or emissions, including any words, descriptions, trademarks, graphics or any other signs that directly or indirectly create the false impression that tobacco products are less harmful than other tobacco products. It can include words such as "low tar", "light taste", "ultra light taste" or "soft".

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Origin:

There was once an American grandmother whose wife died of lung cancer due to excessive smoking, and the doctor identified it as nicotine poisoning.

So, grandma took the cigarette factory to court in a rage, saying that the cigarette factory had the responsibility, knowing that cigarettes would kill people, why not indicate it on the cigarette case? She wanted to remind the world, so she traveled all over the country for seven years, and the matter was recognized by the court, and it was stipulated that this article should be marked on any cigarette case in the future, and the area should not be less than 1/3 of the visible part of the package.

Baidu Encyclopedia-WHO Framework Convention on Tobacco Control