Disclosed herein is an inhalable composition, suitable for use in an electronic cigarette device, comprising at least 1 g/L of nicotine and at least 2 g/L of carbon dioxide dissolved or dispersed in a solvent comprising glycerol and water, wherein the molar ratio of carbon dioxide to nicotine is at least 0.1:1;

wherein glycerol is present in an amount of at least 40% by weight, based on the total weight of the inhalable composition;
wherein water is present in an amount of 1-20% by weight, based on the total weight of the inhalable composition; and
wherein propylene glycol, when present, is present in an amount of no more than 10% by weight, based on the total weight of the inhalable composition.