Beta-carotene and vitamin A supplements may increase the chance for heavy smokers of getting lung cancer and other cancers caused by smoking, according to results from epidemiologic studies.
However, these vitamins in the food doe not increase this risk. It is not clear what effect beta-carotene have on lung cancer in combination with other supplements or by non-smokers. The results from these studies are also controversial.
Vitamin E supplements seem to protect against Cancer, but heavy vitamin E amounts may in fact increase the chance of getting heart problems and stroke.
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