[QUOTE=Cynthetiq]I never really drank for flavor, I drank for effect.../QUOTE]
I don't have scientifically valid testing, just my trial and error tasting, tasting too much and observing the effects. But my strong impression is that if I drink vodka that is multi-filtered, the more filtered the less side effects/hangover and the "cleaner" the taste. As far as I've noticed, most vodkas are about triple filtered; some are quadruple filtered; a few are quintuple filtered. E.g., Skyy is filtered four or five times. Anyway, this relatively cheap Russian vodka called Russiya is quintuple filtered and I think it tastes smoother and cleaner and has noticeably less after-effects/hangovers in case of a rare overindulgence.
I don't know if anyone here knows for sure, but I sort of recall reading but not sure where, that the filtering removes "glycols" which are a component in all vodkas; with less of these glycols many people perceive a smoother taste, plus less of the negative after-effects.
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