Its increasing popularity with American adolescents may be attributed to several factors including use of the drug by adult role models such as athletes, entertainers, businessmen, and professionals; the drug's image as an "upper-class drug that is relatively harmless and produces a superb high"; an abundance of cocaine supplies, making it more accessible; and the appearance of "crack" on the drug scene, which has provided teens with an inexpensive form of the drug that may be smoked. Crack use can result in severe physical dependence after only one or two uses. Once a user has become accustomed to a drug and developed a need for it, abrupt cessation of drug taking results in a withdrawal syndrome. Symptoms can include severe physical pain, tremors, sweating, psychological disturbance, convulsions, and in some cases death. It is still unknown why some people become addicted while others do not. Studies indicate that people who become addicts have underlying psychological disorders. Major disturbances during childhood. .
These types of drugs increase alertness and energy levels. (3) Hallucinogens include LSD, PCP or angel dust. Hallucinogens are commonly associated with panic attacks at the height of the drug experience ("bad trips"). Phencyclidine (PCP) "angel dust". It is difficult to estimate the current use of phencyclidine in the United States because many individuals do not recognize that they have taken it. PCP is frequently laced with other illicit substances (such as marijuana) and the buyer not made aware of its presence. A 1986 National Institute of Drug Abuse survey of high school seniors revealed that over 12% of the students had used hallucinogens and that many of these drugs probably contained PCP. PCP use in the U.S. dates back to 1967 when it was sold as the "Peace Pill" in the Haight-Ashbury district of San Francisco. Its use never became very popular because it had a reputation for causing "bad trips.
