Missouri health officials warn nitazenes, potent synthetic opioids, are hard to detect Explainer: nitazenes and xylazine a cause for concern News Chemistry World RACGP GPs warned amid 'worrying spike' in nitazenes Sydney's top doctor raises alarm after vapers develop opioid addiction Stuff 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