Does quitting smoking reduce the risk of Type 2 Diabetes?

From: Annals of Internal Medicine

Journal rating:
rating: 99%
Study Quality:
rating: 55%

Overall Reliability

Article Quality:
rating: 5%
rating: 75%


  • 10,892 adults aged 45 to 64 years who did not have diabetes when they entered the study in 1987 to 1989.


  • The researchers followed the patients for more than 10 years and collected information from blood tests and surveys about whether persons developed diabetes.
  • They also collected information on smoking behaviours over the years of the study.


  • As expected, the researchers found that smokers had a higher risk for diabetes than never-smokers. However, among smokers who quit, the risk for diabetes was highest within 3 years of quitting and decreased to no excess risk after about 10 years.
  • Weight gain seemed to account in part for the increased risk for diabetes in the first few years after quitting.


  • Yes (with confidence)


Editors Notes

  • Type 2 diabetes mellitus is a common disease that interferes with the body's ability to store energy. The pancreas makes a substance called insulin, which helps the body store energy from food. In type 2 diabetes (adult-onset diabetes), the body makes plenty of insulin but cannot use it normally. The result is high levels of blood sugar, which can eventually lead to blindness, kidney failure, nerve damage, and heart disease.