Toxicologist Albert Donnay believes that chronic exposure to…

Toxicologist Albert Donnay believes that chronic exposure to substances such as carbon monoxide, pesticide, and formaldehyde can lead to hallucinations of the type associated with haunted houses. Donnay speculates on the connection between the prevalence of gas lamps during the Victorian era and start of the 20th century stories of ghost sightings and hauntings, describing it as the “Haunted House Syndrome”. Donnay says that carbon monoxide poisoning has been linked to haunted houses since at least the 1920s, citing a 1921 journal article published about a family who suffered headaches, auditory hallucinations, fatigue, melancholy, and other symptoms associated with haunted houses.

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