The family of hallucinogens includes drugs that induce a distortion of reality in the user, including alterations of sensory perceptions of sight and sounds as well as changes in emotions. Lysergic acid diethylamide (LSD) is the prototypical hallucinogen. It is an odorless and tasteless synthetic chemical, usually ingested as a solution or dissolved on paper or sugar cubes. Typical hallucinogenic doses are 25–75 micrograms. Analogous lysergic acid derivatives can be extracted from morning glory seeds and ergot, a rye fungus. In 2005, annual use among twelfth graders was 1.8%. Among tenth graders, annual use was 1.5% (National Institute on Drug Abuse 2005a).