UNDERCOVER PICTURES OF ANIMAL TESTING www.animalexperimentspictures.com
Today, most of us know that smoking causes lung cancer and a host of other serious diseases. But people were not always so convinced. Although by the 1950s many human epidemiological studies had linked smoking to lung cancer, some scientists still doubted the connection because the disease could not be induced in laboratory animals (2). Tragically, these misleading animal experiments were allowed to cast doubt on the human evidence and as a result health warnings were delayed, costing many lives.
Despite years of further experimentation, it has proved extremely difficult to induce lung cancer in animals by forcing them to breathe tobacco smoke.
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