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Slow is a slang term used for illicitly produced fentanyl (different from the fentanyl produced by big pharma, which is often used for pain management when someone is on hospice). Fentanyl is a dangerous street drug that is known for being inexpensive and very deadly. Throughout the 2010s and 2020s, in the US it said that fentanyl has killed over 100,000 people (I imagine you could easily find a source for this).
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