by Kerry SHERIDAN MIAMI, United States (AFP) — E-cigarette use is exploding among young people and is now “a major public health concern,” the US Surgeon General warned Thursday, sparking disagreement from experts in Britain where the devices are seen more favorably. The battery-powered devices heat a liquid containing nicotine into a vapor that is inhaled, and some experts worry that a new generation of smokers is becoming addicted. About one in six US high […]