Final answer:
Psychoactive drugs, including hallucinogens, can distort a person's perception of reality.
Step-by-step explanation:
Psychoactive drugs are substances that change the function of the brain and result in alterations of mood, thinking, perception, and/or behavior. They include prescription medications such as opioid painkillers, legal substances such as nicotine and alcohol, and illegal drugs such as LSD and heroin. Hallucinogens, a class of psychoactive drugs, can cause profound distortions in a person's perceptions of reality. When under the influence of hallucinogens, people often report seeing images, hearing sounds, and feeling sensations that seem real but are not.