Why do manufacturers who buy cigarettes print slogans on cigarette cases that smoking is harmful to health?

Tobacco is a high-profit national monopoly industry and an important part of national tax revenue; It is possible to ban smoking in theory, but it is unrealistic in practice. For the above reasons, the state has not imposed a ban on smoking. It is wise to mark "smoking is harmful to health" on the cigarette case; Once smokers get sick from smoking, they can avoid being sued by smokers and avoid a lot of unnecessary troubles.