Speedballing[1] – the practice of combining a stimulant like cocaine or methamphetamine with an opioid such as heroin or fentanyl – has evolved from a niche subculture to a widespread public health crisis. The practice stems from the early 1900s[2] when World War I soldiers were often treated with a combination of cocaine and morphine.
Once associated with high-profile figures like John Belushi[3], River Phoenix[4] and Chris...