Supposedly, they still do use some part of the plant, but extract the fun part. Makes you wonder if Coca-Cola has become its' own cartell. Outside of pushing regular sugar, that is.
I used to have a box of coca leaf tea imported from South America. It's like %0.01 the strength of cocaine (which I have never tried). If you can get past the taste, which is reminiscent of damp straw, it works better than coffee. Keeps you wide awake for a few hours with no jittery feeling.
They do still use coca leaf with the cocaine removed. Also fwiw in Cusco, hotels have bowls of coca leaves and you can grab and chew them. It helps with altitude sickness and gives you a little boost of energy. In its unrefined form coca leaf is more like coffee than cocaine.
It's okay, but it's far from my favorite Jarmusch film. I would pick either Dead Man or Ghost Dog: The Way of the Samurai for that (although I haven't seen his more recent films).