Hallucinogens are a diverse group of drugs that alter a person’s awareness of their surroundings as well as their own thoughts and feelings.
LSD (lysergic acid diethyl amide) is a synthetic compound and one of the most powerful hallucinogens. It's typically delivered on a small piece of paper that the user puts into his or her mouth. LSD can cause a person to focus on small details, like the pores of their skin, or see objects in brilliant color. LSD can also prompt strong moods swings that range from joy to depression. An LSD trip can last up to 10 hours, during which time the person can experience impaired judgment and hallucinatory-like experiences. Though LSD is not considered to be addictive like cocaine and heroin, you can build up a tolerance that requires using more of the substance in order to get the same high.