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Historical Impact of Animal Experimentation
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In 1963 studies of human patients revealed a strong correlation between cigarette smoking and lung cancer. All efforts to produce lung cancer in animals failed, leaving scientists with serious doubts on the connection. They eventually distrusted the more reliable human data, and because of this health warnings were delayed for years, meanwhile thousands died of lung cancer. In the early 1940's clinical investigation indicated that asbestos can cause cancer. Again, animal experiments failed to demonstrate this, and proper workplace precautions weren't instituted in the US for decades.
Read more about the historical impact of vivisection
Historical impact of animal experimentation