Since losing his only daughter in a fall from their high-rise flat in Singapore, Delfard Tay has turned grief into purpose, sounding the alarm on drug-laced vapes that put teenagers’ lives at risk.Authorities in the Southeast Asian island state have clamped down on e-cigarettes, introducing strict measures in August to combat a worrying rise in the use of so-called KPods – vapes spiked with synthetic drugs such as ketamine.Tay said that his daughter, 19-year-old Shermaine, was struggling with...