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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
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In which of the following poisoning formication and insanity occurs together?
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The correct answer is  In chronic cocaine users, degeneration of central nervous system will result in hallucinations, convulsions, delirium and insanity. Magnan's symptom or cocaine bugs is characteristic of chronic cocaine users, in which there is feeling as if grains of sand are lying under the skin or small insects are creeping on the skin giving rise to itching sensation (formication, tactile hallucination). Ref: The Essentials of Forensic Medicine and Toxicology by Narayan Reddy, 27th edition, Page 536.