sentence: Some illegal drugs are taken because they cause hallucinations.
sentences_before: Certain drugs can cause hallucinations.
sentences_after: Certain mental illnesses can also cause hallucinations. In some cases, withdrawal of a drug can also cause hallucinations. This has especially been reported by people trying to stop taking sleeping pills, or by alcoholics.
concept_name: illegal drug
headings: Hallucination
categories: Psychology Health