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Antioxidant vitamins are widely assumed to be cancer fighters, though research in smokers has found high doses may actually raise the risk of tumors.Swedish scientists gave antioxidants to mice that had early-stage lung cancer, and watched the tumors multiply and become aggressive enough that the animals died twice as fast as untreated mice.Biologically, scientists couldn't explain why antioxidants might harm.The research doesn't examine whether antioxidants might help prevent tumors from forming in the first place – only what happens if cancer already has begun.The researchers gave Vitamin E, in a range of supplement doses, or an antioxidant drug named N-acetylcysteine to mice engineered to have lung cancer.
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