Even a small quantity of pure ethanol (absolute alcohol) can be lethal due to its toxic effects on the central nervous system and vital organs. Ethanol is rapidly absorbed into the bloodstream, leading to systemic effects. It acts as a potent central nervous system depressant, causing respiratory depression and, in extreme cases, respiratory failure. Ethanol overdose can lead to severe intoxication, unconsciousness, and ultimately, death. The lethal dose varies among individuals, and factors like body weight, tolerance, and overall health play a role. Ingesting pure ethanol poses a significant risk of alcohol poisoning, necessitating extreme caution and awareness of its toxicity.