Co-opting the language and imagery of depression, addiction, or any other mental health issue is just about the shittiest thing an artist can do. Not only does it encourage lonely teenagers to write terrible poetry about how ~DARK AND DEPRESSING~ the world is, it demeans the lives of people who actually have to live with these issues.
Put it this way: the reason I’m drawn to artists like Elliott Smith, Daniel Johnston, et al. isn’t because I think depression and schizophrenia are quirky character traits, it’s because those people were able to create beautiful artwork in spite of their problems. They’re warriors, and they inspire me to power through my own (comparatively minor) issues and get things done.
Put it another way: would it be offensive if I went around pretending to have cerebral palsy because I like Christy Brown’s paintings? Same damn thing.