Between 1910 and 1920 advertising agencies made their mark by publishing cigarettes. During World War I period advertising consisted primarily of full-page, color magazine and newspaper advertisements. Many companies used celebrity endorsements from famous men and women and created slogans for their brand. Some advertisements contained fictional doctors reassuring customers that their specific brand was good for health.
Smoking was also widely seen in films, possibly due to paid product placement.
Demand for cigarettes in North America, which had been ~doubling every five years, began to rise even faster, ~tripling during the four years of war
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