Can cracking your knuckles mess up playing guitar?

I'm thinking the same thing......

I keep cracking my knuckles and i have realized that my flexibility in my fingers is going and i'm finding it hard to keep up with the faster riffs(not finding them hard but becoming tired more easy), my solo playing is also effected as i cant play scales at an even speed anymore. It seems worrying and i know you can lose habits, but for me if i don't crack my fingers then they become stiff and it feels a lot better when cracked, that is the main reason i do it.