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[...] this year the delegates, along with public health regulators around the world, are facing a new, pressing question: what to do about the explosive growth of alternatives to combustible cigarettes. Among the devices being grappled with are e-cigarettes, through which users inhale flavored nicotine vapor; so-called heat-not-burn devices, which warm tobacco sticks but do not release carcinogens by igniting them; and new electronic products like Juul, a flash drive look-alike whose popularity has made it a scourge in American secondary schools.