evidence: "We do have fentanyl that's dangerous, we have xylazine that's poison," Vincent told NPR. "We've had an entire community swept away. I can't even think of all the people I know who have died. My daughter died. Our mentors are dead. It is so dangerous right now." Public health experts say fentanyl, a synthetic opioid far more powerful than heroin, is responsible for the majority of drug deaths. But the supply of illegal drugs is increasingly complex and perilous. [...] "We've had more Americans die of fentanyl than the Iraq, Afghanistan, and Vietnam wars, combined," said Nikki Haley, the former South Carolina governor who is now seeking the GOP presidential nomination, speaking to voters in New Hampshire on Dec. 14.