What was a key finding from research that contributed to the widely accepted fact that smoking leads to an increased lung cancer risk? (Choose the best answer)
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What was a key finding from research that contributed to the widely accepted fact that smoking leads to an increased lung cancer risk? (Choose the best answer)
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The retrospective data showed that smoking or not was a difference in past habits between those with cancer and those without. Patients who had lung cancer were 17 times to 1 more likely to smoke more than 2 packs a day.
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In a prospective study, researchers surveyed two hundred thousand people about their smoking habits and then kept track of them for 4 years. The data indicated that people who smoke cigarettes had a lung cancer rate that was 10 times larger than those who had never smoked.
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Rsearchers in a lab painted tar on animals and tracked whether they got cancerwhile controlling for all extraneous variables. The animals they covered in tar were more likely to contract cancer.
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All of the above studies contributed to this now-accepted knowledge.
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None of the above. These studies are not controlled enough to contribute valuable knowledge.
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