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  1. How does fentanyl compare to heroin or other opiates? - Drugs.com

  2. Fentanyl vs. Heroin: An Opioid Comparison - American Addiction …

  3. Fentanyl - Wikipedia

  4. Heroin vs. Fentanyl | Comparing Effects, Uses & Statistics

  5. Fentanyl Facts | Stop Overdose | CDC - Centers for Disease …

  6. Why would anyone cut heroin with fentanyl? It's cheap, these ...

  7. Heroin and Fentanyl: Dangers of Mixing Opioids - Addiction Center

  8. Fentanyl - StatPearls - NCBI Bookshelf - National Center for ...

  9. Heroin and Opioid Awareness | Opioid Facts - United States …

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