I've got a habit! and a bad one!?

I've recently developed a really bad habit! cracking my nuckles! I can't stop! I don't know how to! any ways to help me stop? I have to stop ! i know you can get athritis and parkinsons disease (when you keep on shaking) so thats why i need to stop! I crack my fingers on porpose but my ankles and toes... show more I've recently developed a really bad habit! cracking my nuckles! I can't stop! I don't know how to! any ways to help me stop? I have to stop ! i know you can get athritis and parkinsons disease (when you keep on shaking) so thats why i need to stop! I crack my fingers on porpose but my ankles and toes crack by them selves (can you also tell me why the crack by them selves) and my knees sometimes when i sit down. I NEED THELP! HOW CAN I GET OVER MY HABIT!?!?!?

thanks!
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