Singapore will start classifying some substances used in vape pods as controlled drugs from next month, paving the way for stiffer penalties as the city state steps up efforts to crack down on vaping.Etomidate, a clinical agent used for inducing general anaesthesia, and related compounds will be treated as Class C drugs for a period of six months, the Ministry of Health and Ministry of Home Affairs said at a briefing on Thursday. The government plans to have new legislation in early...