To find out exactly what makes JUUL "an intelligent e-cigarette," Nitasha Tiku of the Verge got on the phone with PAX Labs CEO James Monsees. First, JUUL is able to "mimic the satisfaction of a regular 'combustion' cigarette. The key to that buzz is a sharp peak of nicotine in the consumer's blood profile about five minutes after she takes her first puff." Second is temperature control. JUUL uses "a precision resistance measurement circuit to figure out the ideal temperature for vaporization." She was instant fan of JUUL: "I found Juul's design simple and intuitive. The disposable cartridges easily popped into the device. Each puff did seem standardized."

"An intelligent e-cigarette" - The Verge
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