Does vitamin E lower cancer risk?

　　Alpha-tocopherol is the most active form of vitamin E and is a powerful antioxidant. In one study, male smokers who took alpha-tocopherol had a lower risk of prostate cancer compared with those who took a placebo. But several other studies have not found the same link. While studies now under way will help clarify this, the promise of alpha-tocopherol for reducing cancer risk appears to be dimming.