People who take a popular vitamin supplement are more likely to develop lung cancer, it has been claimed.
Researchers from the University of Washington in the US found that taking moderate to high doses of vitamin E led to a "slight but significant" increase in risk.
The findings are bad news for fitness obsessives who are still smarting from a study in 2002 linking beta-carotene and lung cancer, which prompted calls for health warnings to be placed on bottles of vitamin supplements.
The Finnish study showed participants were 18% more likely to develop lung cancer if they took beta-carotene, which is converted into vitamin A in the body.
The most recent study, led by Dr Christopher Slatore, initially found unsurprising links between lung cancer risk and smoking, family history, and age. But in addition to these, it uncovered an unexpected association with vitamin E.
Scientists claim the increased risk is equivalent to a 7% rise for every extra 100mg of vitamin E taken per day over 10 years.
The findings appear in the American Journal of Respiratory and Critical Care Medicine, published by the American Thoracic Society.
"These facts confirm well my earlier investigations that vit.E is a factor to enhance malignant growth. Blastomes parasitize for tocopherols on tumor-bearers by studied mechanisms" - Dr. Eugene NEYFAKH, Russia