I have a bit of a habit of cracking my knuckles. I try not to do it in front of people because the popping sounds can be annoying to others, and I don't do it all the time - but it can be very satisfying and very addictive. Also, all my life I've heard that this is very bad for the hands. Is there truth to this? This next video will answer that question in a lot of detail!
Here's a great and a very comprehensive educational video !