Vodka has no added sugar in it. It also shouldn't have residual sugars, like wine does. This means you can think of vodka as a pure mixture of 40% ethanol, 60% water. There is a very small trace amount of cogeners and other chemicals in it, from impurities in the distilling. The higher quality ones, like grey goose, have fewer of these impurities. BTW, IDK where this idea got started, but practically all bottles that say "Vodka" on them are made from GRAINS. The only Vodka made from potatoes will say "Potato Vodka" (ie, Luksosawa). Grey goose, Kettle One, Absolut, Smirnoff, Level One, Belvedere are all grain vodkas, and virtually all your cheap $6/gal vodkas are grain (potatoes are too expensive here). The only potato vodkas I'm aware of are Chopin and Luksosawa.