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The government’s chief tobacco regulator told Congress today that e-cigarettes are almost certainly healthier than tobacco, that much more research needs to be done, but that it needs to regulate them now anyway.

“If we could get all of those people [who smoke] to completely switch all of their cigarettes to noncombustible cigarettes, it would be good for public health,” Mitch Zeller, director of the Food and Drug Administration’s Center for Tobacco Products said today at a hearing that could help determine the fate of e-cigarettes in the United States.