Electronic cigarettes may be closer to smoking cessation devices than regular smokes and regulators are keeping “an open mind” on their potential health benefit, said the top U.S. official overseeing their use.

In comments that may boost the developing $3 billion e-cigarette market, Mitch Zeller, head of the Food and Drug Administration’s Center for Tobacco Products, said the agency is exploring expedited reviews for tobacco products based on risk and toxicity as it prepares its e-cigarette rules.

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