"Use of tobacco among World War II soldiers had an extraordinary effect on relieving the tedium of war, but hooked an entire generation into nicotine addiction."
It was a world war because it involved all the worlds superpowers and was fought throughout the world eg. Western and Eastern European theater, North African theater, Pacific theater etc.
At the start of World War II in 1939 it was limited to just a European war, with the British & French calling it a "phoney war". It wasn't until the wars of Asia & Europe joined up it was...
As the name "World War" suggests, it involved most of the world. Major areas of combat included Europe, Africa, Asia, with some combat in North and South America.
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