When did manufacturers start putting warning labels on cigarette boxes?

Manufacturers began placing warning labels on cigarette boxes in the United States in 1966, after the passage of the Federal Cigarette Labeling and Advertising Act of 1965. This law requires every cigarette package to display a warning label stating that cigarettes may pose a health hazard.

In 1984, Congress enacted the Comprehensive Smoking Education Act, which required that cigarette packages contain four specific health warnings. In the mid 1980s, smokeless tobacco products began placing rotating warning labels on their packaging. U.S. regulations regarding cigarette packaging warning labels are weaker than those of many other countries, according to the Centers for Disease Control and Prevention.