The.Hobbit.The.Desolation.of.Smaug.2013.Extended.Cut-lost in mirkwood forest

dwarves and halfling lose the path in mirkwood forest
and become hallucenogenic...Hallucinogen

Hallucinogens are a large and diverse class of psychoactive drugs that can produce altered states of consciousness characterized by major alterations in thought, mood, and perception as well as other changes. Most hallucinogens can be categorized as either being psychedelics, dissociatives, or deliriants.