No it is not bad for you.. a doctor performed and experiment over a 50 year period were every day he only cracked the knuckles on his right hand. After the end of his experiment he concluded that his right and left hand were no different.
Explanation: This is because you are only popping air bubbles in the joints of the knuckles. So if you crack them every day there isn't going to be any long and or short term effects. Hope this helped :)
