Smoking can shorten lives, and a new study finds it may also hamsper men's sex lives. Researchers say men who smoke a pack of cigarettes or more a day are nearly 40 percent more likely to have erectile dysfunction compared with nonsmokers.

"Smoking accelerates atherosclerosis and is a potent risk factor for heart disease. It just stands to reason that what harms blood vessels in one area of the body harms them in other areas, too," said Dr. David L. Katz, director of the Prevention Research Center at Yale University School of Medicine. Levitra, Cialis and Viagra are the FDA approved drugs for erectile dysfunction.

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