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New evidence on relationship between smoking and T2D risk

In this study investigators examined the association between various smoking behaviours and the risk of developing diabetes. They found that active and passive smoking are associated with significantly increased risks of type 2 diabetes. The risk of developing diabetes was also elevated in new quitters, but this decreased as the time since quitting increased. The evidence adds to the body of evidence suggesting that reducing smoking levels should reduce the incidence of type 2 diabetes.

By Colin Kenny, GP, Dromore

In this study investigators performed a variety of online and manual searches for prospective studies that reported associations between risk of type 2 diabetes and smoking status. They found 88 eligible prospective studies with a total of 5,898,795 participants and 295,446 incident cases of type 2 diabetes across nine countries.

The researchers pooled the results to establish relative risks. They found that the risk of type 2 diabetes was significantly higher when current smoking was compared with non-smoking and former smoking was compared with never smoking. They also identified a dose–response relationship for current smoking and diabetes risk. Active and passive smoking were associated with significantly increased risks of type 2 diabetes. Another finding was that the risk of diabetes is elevated in new quitters but then decreases substantially as the time since quitting increases.

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