Sure, those shots of tequila (and that forbidden cigarette) are the main cause of your headache and unsteady stomach. But believe it or not, the strength of your hangover is also dictated in large part by your genes. An Australian research team found that, among women, nearly 45 percent of the difference in hangover severity from one person to the next is determined by genetic factors. Genes also account for a big part of your ability to “hold” your alcohol without getting sloppy, the research suggests. So blame your mom and dad the next time you wake up feeling like roadkill. You also have your parents (and grandparents) to thank for the five weird traits on the slides ahead.

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