I like better those that have interviews with addcitcs/ex addicts, but YMMV.

Some Meth documentaries [1] and Fentanyl documentaries [2]

[1] https://www.reddit.com/r/Documentaries/search?q=meth&restric...

[2] https://www.reddit.com/r/Documentaries/search?q=Fentanyl&res...