Children's Hospital For Teens Crack Crack or rock is a purified form of cocaine .
Kids usually smoke it in cigarettes or marijuana joints.
Crack is also smoked in glass pipes. The drug is said to take its name from the crackling noise when it's smoked. It is sold in the form of small white, gray, or beige rough chunks which are similar in appearance to sugar. Each pellet is worth about four or five inhalations. A lot of kids try crack as a way to feel good or high, and as a way to forget some of the pressures they are feeling from family and other obligations.