Sorbitol often is used in modern cosmetics as a humectant and thickener. A humectant is a hygroscopic substance used to keep things moist. Moisturizers contain ingredients that are either occlusive (blocking) or humectant. The essential components are an abrasive, binder, surfactant and humectant. Glycerol is added as a humectant. Dry infusion is the combination of partial dehydration and osmotic dehydration using a humectant. Osmotic dehydration is the process of soaking food in highly concentrated solutions of humectant. They are often used as both a sweetener and as a humectant (moisture-retaining ingredient). These humectant food additives are used for the purpose of controlling viscosity and texture. It is also used as a humectant, stabiliser, and thickening agent. Osmotic drying using a humectant results in a soft texture in the final product. Vitamin B5, when applied topically, has humectant properties and conditions the skin. Water diffusion from the food to the humectant solution is caused by osmotic pressure. Further, e-cigarettes produce aerosol by heating a humectant containing nicotine without burning tobacco. Finally, sugar used commonly added as a humectant increases the caloric value of the food.