[header] How to spot signs of lsd use [title] Determine if someone may be experiencing hallucinations. [step] Hallucinations are common for someone on acid. Someone who is using lsd may report seeing things that are not there, hearing things that are not producing sound, or smelling things that are not producing any odor. 
The person may also see things with their eyes closed. [substeps] If the user has grandiose thoughts, such as thinking they can fly, or if they have suicidal or homicidal delusions or hallucinations, seek emergency help immediately.