Sure, study also has to be done in a certain way for all of them, maybe time of the day matters, time between the cracking, other activities, going to the gym, diet, blablabla...
Thats what we got, until we get something better and i believe we always will. Is it better than nothing or is it worse? You decide, go by intuition or by what is presented. I always cracked my joints and will do. A doctor once said to me its nothing harmful and i should not give it attention, i trust his saying.
After all its also a psychology matter, if you crack them and think about it all day long or feel bad about it, dont do that, if you dont mind, just go on!
