The hangover

The New Yorker finally tackles this important subject. The whole thing is worth reading. Here's a sample:

Application of the hair of the dog may sound like nothing more than a way of getting yourself drunk enough so that you don’t notice you have a hangover, but, according to Wayne Jones, of the Swedish National Laboratory of Forensic Medicine, the biochemistry is probably more complicated than that. Jones’s theory is that the liver, in processing alcohol, first addresses itself to ethanol, which is the alcohol proper, and then moves on to methanol, a secondary ingredient of many wines and spirits. Because methanol breaks down into formic acid, which is highly toxic, it is during this second stage that the hangover is most crushing. If at that point you pour in more alcohol, the body will switch back to ethanol processing. This will not eliminate the hangover—the methanol (indeed, more of it now) is still waiting for you round the bend—but it delays the worst symptoms. It may also mitigate them somewhat. On the other hand, you are drunk again, which may create difficulty about going to work.