How we made Christiane F – the shocking cult film about a child heroin addict https://www.theguardian.com/culture/2021/apr/19/how-we-made-christiane-f-the-shocking-cult-film-about-a-child-heroin-addict
I worked in a movie theater when this film came out in the USA. I think I watched it about five times. Wish I could find it on DVD. Amazon's doing a remake. :-(