Oliver Markus said this quote
“ Addicts don't like when you tell them they are all the same. Of course not. Who would? But to me, addicts are like actresses, who all audition for the same role in a horror movie. It doesn't matter how they got to the audition. It doesn't matter how or where they grew up, once they get to the audition, all the actresses act in the same way and read the same lines. They all become the same character. ”