A new study suggests some some chemicals, especially the chemicals in cigarette smoke, are responsible for many cases of diabetes and obesity.
Federal researchers appointed by the National Toxicology Program said Thursday that arsenic and chemicals found in cigarette smoke, pesticides and plastic are strongly linked to diabetes and obesity.
The strongest link was between pregnant women who smoke and children who later become obese and develop type-2 diabetes.
However, the researchers stress that most cases of obesity and diabetes are caused by poor diet and lack of exercise.
Scientists already knew that chemicals in the Vietnam-era herbicide Agent Orange can cause diabetes.
The Department of Veterans Affairs last year compensated 270,000 Vietnam War veterans who developed the disease after their service.