People who smoke have a higher risk of developing type 2 diabetes, new research claims.
The study published in the Journal of the American Medical Association looked at the link between smoking and glucose abnormalities, and found smokers are 40% more likely to develop the condition.
The experts discovered what appears to be a connection between smoking and the risk of diabetes, depending on how many cigarettes are smoked a day.
People smoking 20 or more a day have a 61% increased risk, compared with lighter smokers where the risk is 29% higher, the researchers added.
Dr Carole Willi, from the University of Lausanne, examined 25 studies conducted between 1992 and 2006 in an effort to find any connection between glucose problems and smoking.
The total number of people involved topped 1.2 million, and 45,844 new cases of diabetes were reported over five to 30 years later.
The authors wrote: "We conclude that the relevant question should no longer be whether this association exists, but rather whether this established connection is causal.
"We recommend that future studies focus on plausible causal mechanisms or mediating factors such as obesity, lack of physical activity, dietary habits and stress levels."
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Journal of the American Medical Association
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