What profound effect do hallucinogens have on users?

Hallucinogens are substances that significantly alter an individual's perception, mood, and cognitive processes. The profound effect they are most noted for is the intense distortion of reality that users experience. This can manifest as changes in visual and auditory perceptions, such as seeing vivid colors or shapes, hearing sounds that are not present, or experiencing a warped sense of time and space. This altered state of perception can lead to profound psychological experiences, including feelings of euphoria, introspection, or even anxiety, depending on the individual's mindset and environment.

While reduced attention span, increased body temperature, and decreased motivation can be associated with various substances or withdrawal symptoms in some cases, they do not encapsulate the primary and most striking experience of hallucinogens. In particular, the intense perception distortion is characteristic of how these substances interact with brain chemistry, leading to their unique psychological effects. This primary effect is what differentiates hallucinogens from other types of drugs and supports the assertion that perception distortion is central to their impact on users.