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 last month to combat a worrying rise in the use of so-called KPods -- vapes spiked with synthetic drugs such as ketamine.

Originally published on doc.afp.com, part of the BLOX Digital Content Exchange.