What feeling may someone experience when under the influence of hallucinogens?

When someone is under the influence of hallucinogens, they may experience paranoia, which can manifest as feelings of suspicion, anxiety, or fear that others are watching or planning something against them. Hallucinogens, such as LSD, psilocybin mushrooms, and others, alter a person's perception of reality, often leading to distorted thoughts. This alteration can cause individuals to feel disconnected from their surroundings, leading to an increased sense of vulnerability and mistrust in their environment, thus fostering feelings of paranoia.

The effects of hallucinogens can vary widely, and while some users might experience euphoria or calmness, it is common for others to have negative reactions, including anxiety or paranoia. Intense hunger is not typically associated with hallucinogens to the same extent as it is with other substances like stimulants. Therefore, the experience of paranoia is a well-documented effect of hallucinogen use, making it the most accurate choice in this context.