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Juuls are especially popular among American teens, who post viral selfies and videos showing friends pulling drags from the discreet, USB-stick-like devices in class. Scientists and public health experts have sounded the alarm on the practice, known as "Juuling," saying the e-cigs pose a major health concern to young people. Chief among their worries is the Juul's uniquely high concentration of addictive nicotine, which is more than double that of other e-cigs (..)