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It has become fashionable to order a martini without vermouth now that there are so many top quality vodkas and gins available to us. Back in the day when there was a dearth of understanding for fermentation technology and the intricacies of distillation, spirits were bit more rough and primitive. The vermouth was often added to mask the undesirable flavors and to "smooth" out the spirit that it was blended with. In the case of a Martini or a Manhattan, it also brings the overall alcohol level of the drink down, making it possible to have more than one over the course of a night. Believe it or not, both of these used to be two ounce drinks and were never intended to fill the huge seven or eight glasses that are commonly used in restaurants or bars now. If you are ordering a vodka with no vermouth, you are drinking three to four shots of vodka! I don't know how people manage to drink two or more in an hour's time and are still able to taste food, let alone stand.