>>2604651a simple google search will tell you, but im going to say it anyway :^)
treating your back with a crack is not the answer. If done in moderation, your back is less likely to experience dangerous side effects. The cracking sound is actually a release of carbon dioxide gas that builds up in a joint. Self–back cracking can cause injuries such as muscle pulls or even strain tendons and tear ligaments. You can also over-stretch yourself in an attempt to crack your back. It is even more contraindicated to self-crack your neck. Self-cracking your neck can compromise your blood supply to your head and neck.
tl;dr: yes, its bad for you.
