I don't see why it wouldn't be. It doesn't really cause any damage, then again neither does the fear of the number 13 but apparently you can get treated for it.

I've been cracking my knuckles constantly (every five minutes? Every minute? idk...) ever since I was about four. It has never stopped since. And it's not just my knuckles but my jaw, elbows, knees, neck, back, ankles, toes...anything i can crack. I'm cracking my joints now as we speak. It's just a habit really. It's probably stress related, but I do it so much I can't really tell why I do it.

I don't really want to stop either since i know it can't cause arthritis, though I heard it can tear ligaments and stretch out my fingers...not sure how plausible that is either...But my parents HATE it when I do it and yell at me and tell me its gross and that I'm gonna get arthritis.