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Hallucinogens are primarily characterized by their unique ability to alter perception, mood, and cognitive processes without typically leading to physical dependence. These substances, such as LSD, psilocybin (found in certain mushrooms), and mescaline, primarily affect the brain's serotonin receptors, which results in altered sensory perception and can induce visual or auditory hallucinations.

Unlike many other psychoactive substances, hallucinogens do not generally lead to cravings or withdrawal symptoms that are associated with substances that can cause physical dependence, such as opioids or alcohol. While users may develop a tolerance to hallucinogens, meaning they might need to consume larger doses to achieve the same effects, this differs substantially from the physical dependence seen with many other drug classes.

Physical dependence is characterized by the presence of withdrawal symptoms upon cessation of use, which is commonly seen with stimulants, depressants, and certain narcotics. Hallucinogens, however, largely do not produce such physical symptoms, making this characteristic pivotal in understanding how they differ from other psychoactive substances.

Therefore, the focus on non-dependence in the context of hallucinogens is a crucial aspect of their classification within psychoactive substances.