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Ultd nicotine salts are a type of nicotine used in e-liquids for electronic cigarettes. They are made from a combination of nicotine and a specific type of acid, typically benzoic acid, which reduces the harshness of the nicotine and allows for higher nicotine concentrations to be used without the harsh throat hit associated with traditional freebase nicotine. The result is a smoother nicotine experience that can more closely mimic the sensation of smoking a traditional cigarette.