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There is a critical difference between heroin, and heroin laced with uknown amounts of a fentanyl analog. The adulterated stuff kills even first time people experimenting with drugs. Joe Perry & Steven Tyler (Aerosmith's "Toxic Twins") are still here. Clapton lives. So does Led Zeppelin's Jimmy Page. All those guys would be long dead if there had been fentanyl lacing back in the 70's.
That's a little bit like the football-betting-sequence fallacy -- if I send a thousand letters out, with 50% predicting team A wins and 50% predicting team B wins, and do so successively for 10 weeks, at the end of the 10 weeks a small number of people will have gotten my letters "correctly predicting" the football outcome 10 times in a row. But of course, I didn't know anything about the games. You can name a few of…
Oh, plenty!