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Marijuana is prepared by crushing the dried flowering cannabis top and leaves into tea like substance, which is rolled into a joint and smoked. The user usually experiences a distorted sense of time and distance, and suffers from reduced attention span and loss of memory. Symptoms may include impaired judgment, slow reaction time, confusion of time sense and limited motor skills.

MDMA (Ecstasy)

MDMA (3-4 methylenedioxymethamphetamine) is a synthetic, psychoactive drug chemically similar to the stimulant methamphetamine and the hallucinogen mescaline. Street names for MDMA include "ecstasy," "XTC," and "hug drug." Drug use data sources for 21 metropolitan areas nationwide indicate that MDMA, once used primarily as a club drug, is being used in a number of other social settings.** In high doses, MDMA can interfere with the body's ability to regulate temperature. This can lead to a sharp increase in body temperature (hyperthermia), resulting in liver, kidney, and cardiovascular system failure. Because MDMA can interfere with its own metabolism (breakdown within the body), potentially harmful levels can be reached by repeated drug use within short intervals.

Research in humans suggests that chronic MDMA use can lead to changes in brain function, affecting cognitive tasks and memory. MDMA can also lead to symptoms of depression several days after its use. These symptoms may occur because of MDMA's effects on neurons that use the chemical serotonin to communicate with other neurons. The serotonin system plays an important role in regulating mood, aggression, sexual activity, sleep, and sensitivity to pain. In addition, users of MDMA face many of the same risks as users of other stimulants such as cocaine and amphetamines.

Research in animals links MDMA exposure to long-term damage to serotonin neurons. A study in nonhuman primates showed that exposure to MDMA for only 4 days caused damage to serotonin nerve terminals that was evident 6 to 7 years later. While similar neurotoxicity has not been definitively shown in humans, the wealth of animal research indicating MDMA's damaging properties suggests that MDMA is not a safe drug for human consumption.

A synthetic opiate with action similar to that of morphine and heroin except that withdrawal is less severe. It is used as a substitute for heroin in the treatment of addicts.

Amphetamine, dextroamphetamine, methamphetamine, and their various salts are collectively referred to as amphetamines. In fact, their chemical properties and actions are so similar that even experienced users have difficulty knowing which drug they have taken. Methamphetamine is the most commonly abused.