<prompt> A person whos a drug addict stas hearing light and seeing voices. The substance is:LSDMarijuanaCocaineAlcohol  <response>: LSD is a hallucinogen. There is often a cross-over of perceptions synaesthesia so that sounds are seen or felt and colours are heard. Distoions of body image are common: a limb may appear to shrink, or become enormous and may seem completely separate from the rest of the body. Ref: Ghodses Drugs and Addictive Behaviour: A Guide to Treatment By Hamid Ghodse, 2010, Page 93; Kaplan and Sadocks Concise Textbook of Clinical Psychiatry By Benjamin J. Sadock, Virginia A. Sadock, 2008, Page 127 