Cigarettes were handed out to American service men during World War II, and more soldiers who started smoking during the war died from smoking than died from the war. So if the New World was looking to extract some measure of revenge for smallpox and measles and chickenpox, mission accomplished. Best wishes, John Green. Now on to animals. American animals like llamas and guinea pigs never really caught on in Eurasia. But imports to the Americas, like pigs, cows, and horses, were revolutionary. Let's go to the Thought Bubble.