RACGP GPs warned amid 'worrying spike' in nitazenes More than 1200 vape vials laced with nitazene, a synthetic opioid 200 times more potent than morphine, were sold across Sydney, sparking Australia's first arrest over vapes spiked with the drug. Police Explainer: nitazenes and xylazine a cause for concern News Chemistry World Deadly nitazene vapes: First Australian arrest made in Sydney The Australian Sydney's top doctor raises alarm after vapers develop opioid addiction Stuff