Responding to the worsening epidemic of e-cigarette use by kids of middle-school and high-school age, the Food and Drug Administration announced Thursday that it will ban, within 30 days, flavored e-liquids other than menthol and tobacco — but only when they’re packaged into cartridges to fit on popular devices such as those marketed by Juul. The FDA rightly observed that young people prefer these cheap, cartridge-based e-cigarettes that deliver a jolt of nicotine because the devices look appealing — many resemble a USB drive — and are easily concealed. But policymakers struggle to keep up with the rapidly changing preferences of young people, and the new rules appear to have overlooked different devices that are gaining popularity with kids.

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