Good question!!! The last I read many years ago, I don't think that joint cracking causes arthritis. But I haven't read up on the latest news about that, so I really don't know.
All I can tell you is that I stopped cracking my joints many years ago. It was embarassing that when I ran as a teenager, my joints would continue to crack while running. I think that it's a nervous habit that for me was extremely difficult to quit.
It literally took decades for this cracking to completely go away from me while running(after I quit about age 21 or so), such that today when I run (I'm now 51), there's no problem with this.
There's a technical reason why the joints pop with that noise when you "break" them that I can't remember now. But everytime you snap them, the body has to rebuild this joint again somehow. I think it's something like gas between the joints that's released. Maybe someone out there can fill you in with more details.
One time when I was 15 or 16, I got a very bad flu. Afterwards, I got a secondary infection in my knuckles that the doctor treated with antibiotics. It got me to thinking that what I was doing to my body wasn't all that great. It took me years later, to finally quit.
I hope that helps somewhat.
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