What does crack do to you?

because you touch it.

lols simple dont shot it up/ and or smoke it lawls

Your joints are releasing the synovial fluid and makes a cracking noise.

Well actully, when you crack your back, its not like a bone or joint cracking. Its sort-of "bubbles" in your back from spinal fluids.

So your body can release its junk, which is part of the human digestive system. Also known as 'pooping'.