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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