UK trials have begun of an e-cigarette that can be locked to prevent anyone but its owner puffing on it.
The Juul C1 e-cigarette pairs with an Android smartphone to limit who can use it as well as to provide a way of monitoring how often the user vapes.
Juul said the C1 could only be used if people got through age-verification and face-recognition checks.
But anti-smoking campaigners said it was too soon to say if the tech would do much to prevent underage vaping.
Juul has previously faced criticism that its products are being widely used by teenagers.
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