No, ghosts are not real
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Hallucinations may cause people to believe they have seen a ghost
Hallucinations are common occurrences that cause people to believe they have seen a ghost. The toxins released from carbon monoxide poisoning has physiological effects, which can make people believe that their house is haunted, Sleep paralysis is also a common occurrence that causes hallucinations, leading people to believe that they have seen or felt a ghost.
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