Once feared, illicit fentanyl is now a drug of choice for many opioid users

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One of the deadliest street drugs, illicit fentanyl, has transitioned from a hidden killer that people often hope to avoid to one that many drug users now seek out on its own.

The shift to intentional use of fentanyl underscores a worrying trend in the country's ongoing opioid epidemic, experts say: That a growing number of people have become so tolerant to opioids like heroin, that they're turning to the synthetic compound, which is up to 50 times stronger.

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