Which is a side effect associated with hallucinogenics?

The association of rapidly changing moods with hallucinogenics is accurate because these substances can significantly alter a user's emotional state and perception. Hallucinogens, such as LSD or psilocybin, can lead to profound changes in feelings and thoughts, causing individuals to experience intense emotional shifts within a short time. This variability can lead to feelings of euphoria, fear, or confusion, depending on the user's mental state and environment at the time of use.

In contrast, other effects such as increased appetite or drowsiness are more commonly linked to different types of substances, such as stimulants or depressants, rather than hallucinogens. Decreased heart rate is also not a typical effect associated with these drugs; instead, hallucinogen use can sometimes lead to increased heart rate or other cardiovascular changes. Thus, the association with rapidly changing moods stands out as a key characteristic of the effects of hallucinogenics.