^ I think you've hit the nail on the head there.
The endorphins released help, definitely, but as mentioned, eating chocolate would work just as well there. I think it's because you develop a habit, you get used to having it there to turn to. As if the feeling of it being there makes you want it again and again. Frame of mind... Yes. "I feel bad. I want to hurt myself" instead of "I'm not feeling good today, I'll find something I enjoy".
I'm rambling. But you get the idea.
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