During World War II, cigarettes were a mainstay of a soldier's life. They appeared in soldiers' C-rations and were either smoked for a bit of relaxation or sold on the black market for any number of items. Tobacco companies loved it when soldiers smoked during the war for many became addicted and bought cigarettes for decades after the war ended.
In addition to adding new customers, World War II affected the tobacco companies by forcing them to change their packaging due to rationing. Find out more about the history of cigarettes in World War II in this article called The Cigarette Camps from Skylighters.