Oh great find! I didn't see that in my search results but might've just had the wrong keywords.
Yeah, I'm not surprised - motor vehicle accidents were always super high on the list for that demographic so if fentanyl is even remotely close to the number reported above it would easily surpass everything else.
https://www.snopes.com/fact-check/fentanyl-overdose-death/
Interesting that Google searches for this info return RT results