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Knuckle cracking is indeed a build up gas ( mainly nitrogen) between the joints.
Arthritis i would say would not result from cracking any parts of your body however it could cause other damage. To crack a joint you need to strech it to a point that is not normally at. Always streching it that far could result in over streching ligaments and tendons and that may have some ill effects.
plus it is annoying.
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