Final answer:
Hallucinogens include substances like LSD that create profound perceptual and emotional changes. They can be used recreationally for a 'high' or ritually for spiritual experiences. Their effects on the brain are linked to disrupted neurotransmitter communication.
Step-by-step explanation:
A hallucinogen is a type of psychoactive drug that can cause significant alterations in perception, thoughts, and feelings. These substances can lead to hallucinations, which involve seeing, hearing, or feeling things that are not actually present. Classic hallucinogens, such as LSD (d-lysergic acid diethylamide), are powerful substances that alter mood and perception. LSD is synthesized from lysergic acid and can be found in various forms, including tablets and gelatin squares. Dissociative drugs, another category of hallucinogens, may also induce profound perceptual changes and emotional swings.
Recreational use of hallucinogens is primarily for achieving alterations in thinking and perception, often referred to as getting a "high." Similarly, certain hallucinogens have a long history of ritual use by various cultures for religious or spiritual ceremonies. While the exact mechanisms of how hallucinogens affect the brain are not fully understood, they are believed to disrupt communication between neurotransmitter systems that regulate various bodily functions and states of consciousness.
During the 1990-2001 survey period mentioned, hallucinogens were reportedly widely used among high school seniors, indicating a significant public health concern regarding the potential risks and impacts of these substances on young individuals' health and well-being.