A mainstay of health research today, these studies compare two cohorts of people: the cases, who all have a particular disease or condition, and the controls, who are as similar to the cases as possible but, crucially, dont have the disease
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Scientists have shown that NNK exposure leads to cancer of the lung and the pancreas
Spain was following the example of 10 other EU countries, among them Belgium (the first), France and the United Kingdom
Each participant was then handed the four Canadian inserts, and told that these were used in cigarette packs in Canada