Crack is cocaine that can be smoked. Because it is taken into the body at such a high level of purity, crack is more dangerous and addictive than cocaine. Designer hallucinogens distort perception and thought. In addition, designer hallucinogens may cause restlessness and increased heart and breathing rate. Examples of designer hallucinogens include MDMA and Ketamine.
Users also lose their sense of time and space, as well as their sense of who and where they are.
This designer drug is similar to PCP in that the user may not feel physical pain, and its effects can promote suicidal thoughts and violence. Continued use of certain designer drugs causes addiction. That is, the user becomes dependent on the drug's effects on the mind and body. As use continues, the desire to avoid the discomfort of withdrawal leads to abuse and a high rate of relapse when efforts are made to quit. Withdrawal is the process of quitting drugs.