To the best of my knowledge, Europe does not have a fentanyl problem comparable to that of the US with last I checked 50+% of overdoses in the US having traces of it in their system. Our wide open southern border [not a comment on immigration] allows this poison to spread far and wide.
OxyContin and similar prescription drug addictions are widespread, at one time (still?) heavily pushed by deep pocketed pharmaceutical companies. I think that was a uniquely American situation. I wonder how many of the people now addicted to other opioids in the US were initially exposed via these prescription drugs.