Researchers enrolled a group of 10,892 middle-aged adults

Last updated: 7/17/2022

Researchers enrolled a group of 10,892 middle-aged adults and studied them over a period of nine years. They found that smokers who quit had a higher risk for diabetes within three years of quitting than either nonsmokers or continuing smokers. (a) What type of observational study is this? This is a sample survey study. This is a cohort observational study. Actually this is not an observational study, this is a controlled experiment. This is a case-control study. (b) Does this show that stopping smoking causes the short-term risk for diabetes to increase? Should a doctor cite this study to tell a middle-aged adult patient who smokes that stopping smoking can cause diabetes and advise him or her to continue smoking?