in 1953, American scientist Wendell discovered that smearing tar produced by burning cigarettes on the skin of mice could cause skin cancer in mice. After the results of this experiment were announced, the sales of cigarettes in the United States dropped by 6%.
In January, 1964, a special committee set up by the American government announced their findings: Smoking is the main cause of the increasing number of lung cancer patients, and smoking can also cause emphysema, bronchitis, heart disease and premature death. The publication of this survey report, like a blockbuster, caused great panic in the society, and the sales of cigarettes in the United States dropped by 25% overnight.
in 1965, the U.S. congress passed the cigarette trademark advertising act, which made it mandatory to write a warning that "smoking is harmful to health" on cigarette packages. Obviously, the health hazards of smoking make most Americans decide not to smoke any more.
The cowboy in Marlboro cigarette advertisements in the United States was once regarded as the most successful advertising image. Strong American cowboys successfully equate smoking with masculinity. However, cigarettes are killing the cowboys! In July 1992, when people saw Wayne McLean, who once played a cowboy in an advertisement, on TV again, the tough guy who used to be full of pride in the advertisement had been tortured by lung cancer. In front of countless TV viewers, McLean said on his deathbed, "Never tell children that smoking can kill people. I am the best example …". Maclean died of lung cancer at the age of 51. Three years later, David McLean, the first American actor to play a cowboy in an advertisement, also died of lung cancer caused by smoking.