Yea, but its use only exploded exactly 2 decades ago, when deaths attributed to it doubled from 4 years prior.

https://en.wikipedia.org/wiki/Fentanyl_crisis

I don’t deny that, I’m just clarifying the OP that relates the issue we’re seeing “now” to the invention of fentanyl. It’s more complicated than the presence of the drug, like you said it relates to the changes in usage, irrespective of when the drug was invented.