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That was the responsibility of the Humane Society of the United States, she said

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Tobacco smoking is responsible for the deaths of at least six million people every year and, if current trends continue, the World Health Organisation predicts more than 1 billion tobacco-related deaths this century

Using eye-tracking technology, the researchers measured how long participants viewed various parts of the ad, how many times they viewed each area of the ad, and other eye measures that might determine if someone is paying attention

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