Crack cocaine, also known simply as crack or rock, is a free base form of cocaine that can be smoked. Crack offers a short, intense high to smokers. The Manual of Adolescent Substance Abuse Treatment calls it the most addictive form of cocaine. It is considered both dangerous and illegal.
In the cartoon crossover special "Cartoon All-Stars To The Rescue", Michael tries to use the money he stole from his sister Corey's piggy bank to buy crack from a drug dealer in the local video arcade when the police come after both him and the dealer.
Apart from the special, it doesn't appear in any other forms of Smurfs-related media.
