Researchers have developed a fentanyl vaccine that blocks the drug’s high, although experts caution seeing it as a silver bullet. In 2021, the drug epidemic in America hit a grim milestone, with more than 100,000 overdose deaths—more than in any prior year. Two-thirds of those deaths were a result of synthetic opioids, like fentanyl—a drug that’s up to 50 times stronger than heroin.Read Full Story