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ABOUT A decade ago, the e-cigarette industry began to boom in the United States, largely unregulated. Vaping was much safer than conventional smoking, and the devices helped some longtime smokers to moderate their highly deadly habit, but e-cigarettes also addicted a generation of new nicotine users. Now, finally, the Food and Drug Administration is stepping in more forcefully to encourage the positive effects of e-cigarettes and discourage the drawbacks.