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A research team, led by Dr. Fangyi Gu of the U.S. National Cancer Institute, interviewed more than 3,200 current and former smokers in the United States and Italy. All of the smokers were asked about their smoking history and when they typically had their first cigarette of the day.
The link between lung cancer and the first cigarette of the day was stronger in current smokers than in former smokers, and in lighter smokers than in heavier smokers. There were no differences between men and women.
The study was published June 19 in the Journal of the National Cancer Institute.
Further research is needed, and the study can only point to an association between the timing of a smoker's first cigarette and lung cancer risk; it cannot prove cause-and-effect.
However, assessing when smokers have their first cigarette of the day "may improve lung cancer risk prediction and could be useful in lung cancer screening and smoking cessation programs," the study authors wrote.
-- Robert Preidt
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SOURCE: Journal of the National Cancer Institute, news release, June 19, 2014