Yeah, I'd say my eating disorder, which is something of an addiction. It makes me anxious at every moment and so tired. Every moment I'm awake I have to keep fidgeting, and when I don't have anything planned I sleep until 3 or 4 PM because at least I'm not eating. I have a BMI of 12.2, my hair's falling out and I have constant, painful irritation on my throat from vomiting so much.
Hopefully it kills me so I don't have to.