Crack base, is a vapor form of cocaine that can be smoked. Due to the short, intense nature of the smoked form, crack is extremely addictive. Street names for crack cocaine include: rock, crackers, smoke, Bebe, bings, and French fry.
Links
[1] https://monocounty.ca.gov/sites/default/files/styles/gallery500/public/imageattachments/sheriff/page/6432/crack_baggies.jpg?itok=6C42RvBk
[2] https://monocounty.ca.gov/sites/default/files/styles/gallery500/public/imageattachments/sheriff/page/6432/crack_cocaine.jpg?itok=0aN6EDo8