Tip - How Do I Tell If Someone Is Smoking Crack? | LIVESTRONG.COM

Crack is a street drug that affects the central nervous system by increasing dopamine levels in the brain. Crack is extremely addictive, according to the National Institute of Drug Abuse, and can be smoked, snorted or dissolved in water and injected into a vein. Rock cocaine that has been heated makes a crackling sound as it becomes a vapor that...