Thats a good question... I did some research on this question because I was pretty curious on that question
I personally don't like the contracts. I never had to sign one, but to me you shouldn't be force to stop. It should be on your own free will. Even I recommend you do stop!
In the end they want you to be safe and that's why they wanted you to sign a contract saying you won't harm yourself. That's the reason why you probably signed it. If you do harm yourself, please don't keep it a secrete from them they want you to be honest with them if you do break the contract. Honesty is the best policy when it comes down to. They probably recommend some other treatment. But they might not. It kinda depends on who you are recieving help from and what type of person they are. But they want you to be safe. Which is pretty understandable.
Feel free to
PM/
VM me if there is any other questions or if you want to talk
I hope all goes well