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We examine several addictive / abused drugs such as cocaine , amphetamine , PCP , THC , MDMA , nicotine and alcohol . For example , MDMA or " Ecstasy " and methamphetamine are both becoming increasingly popular with young adults who attend organized all night social gatherings or " raves . Sources in Miami , St. Petersburg , Honolulu , and San Antonio report marijuana use in combination with other drugs , specifically alcohol , cocaine , heroin , MDMA , and LSD . Given the cyclical nature of the kinds of drugs users choose to abuse , relatively little is currently heard about such hallucinogens as psilocybin , mescaline , or the alphabet soup / designer drugs like LSD , PCP , MDMA , STP , etc. They are , however , among the oldest of recognized mind-altering substances . Some marijuana dealers also sell hallucinogens , including LSD , psilocybin , MDMA , and Ketamine , and a variety of pills such as tranquilizers , sedatives , and hypnotics .