Drug films are films that depict either illicit drug distribution or drug use, whether as a major theme, such as by centering the film around drug subculture or by depicting it in a few memorable scenes. Drug cinema ranges from gritty social realism depictions to the utterly surreal depictions in art film and experimental film. There is extensive overlap with crime films, which sometimes treat drugs as plot devices to keep the action moving. The following is a partial list of drug films and the substances involved.