Very true, alcohol is much worse by most metrics, both in terms of number of addicts, number of deaths/year [1][2] and general damage done to the body. [3][4]. (I'm not trying to be cynical, just stating facts.)
> Prior to fentanyl, what was the percentage of high functioning heroin addicts compared to people living on the street? I can't find any research on that question, and I'm somewhat skeptical that your friend is the norm.
There's no data on self-reported addiction, for obvious reasons, but there is data on overdoses: "Fatalities involving only heroin appear to form a minority of overdose occasions, the presence of other drugs (primarily central nervous system depressants such as alcohol and benzodiazepines) being commonly detected at autopsy." [5]
I've met good people addicted to heroin. They've been through more hell than the rest of us can ever understand, almost entirely because of those times when they couldn't access it. If I could press a button to forever ban them access to any opioid, I'd press that button; they'd get over it in a few months and thank me. But that's impossible. The second best option is to allow them access to a clean, low-cost, prescription of it for the rest of their life.
[1] https://drugabusestatistics.org/alcohol-abuse-statistics/ [2] https://drugabusestatistics.org/heroin-statistics/ [3] https://www.sciencedirect.com/science/article/abs/pii/002239... [4] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7328574/ [5] https://onlinelibrary.wiley.com/doi/abs/10.1046/j.1360-0443....