Survey reveals illicit opioid use, especially fentanyl, is far higher than official U.S. estimates suggest.

A recent survey indicates that illicit opioid use, particularly illicitly manufactured fentanyl, in the U.S. is significantly higher than government estimates suggest. The survey found that 11% of respondents reported using illicit opioids in the past year, with 7.5% using fentanyl, compared to the government's estimate of 0.3%. Researchers suggest that differences in survey methods could explain the discrepancy.