A night out in Okinawa ended in an ambulance ride for one young woman, her body unresponsive after a single puff from an e-cigarette.She had joined a growing cohort of Japanese youth being ensnared by “zombie juice”: a potent sedative sweeping Asia’s party scene that is now causing alarm in Japan.Etomidate, a drug once reserved for use in operating theatres, has increasingly found its way into the hands of young club-goers, smuggled in by criminal syndicates and inhaled through flavoured...