One drink, two drinks, half a drink? Who knows. (Credit: TasiPas/Shutterstock) Alcohol can be a wonderful thing. It can also be a very bad thing, and the line between the two is, well, blurry. Knowing when enough is enough is something of an art, but establishing where to draw the line is made more difficult due to the myriad intoxicants at our disposal. And, as a new study shows, the official guidelines for what actually constitutes an alcoholic drink, which should presumably provide sober advice on our drinking habits, aren't much help either.