Which of the following statements about hallucinogens is true?

Hallucinogens are substances that significantly alter perception, mood, and various cognitive processes. The correct statement emphasizes that these substances can lead to altered perceptions and other sensory experiences, which is one of their primary effects. Individuals under the influence of hallucinogens often report seeing, hearing, or feeling things that are not present, or experiencing changes in their perception of time and reality. This characteristic is essential in understanding how hallucinogens function and their potential impact on individuals’ experiences.

The other options do not accurately reflect the hallmark effects of hallucinogens. While some substances may impact anxiety, hallucinogens are notably different in that they mainly induce sensory alterations rather than causing direct physical relaxation or immediate physical dependence, which is more common with other drug classes such as opioids or depressants.