Well it is a blood thinner.
Another person, totally not drunk, hit from behind. She could see the car coming and knew they wouldn't be able to stop (icy roads).Even tho half of her brain was saying “just let go and relax”, the other half was saying “stand on the brakes! Grip the steering wheel firmly! Hunch your shoulders”. the illogical part of her brain won, and she lost about 3 weeks of memories. Even tho the airbags did not deploy, and she did not hit her head, she had a soft concussion. She would have been much better off if she would have just relaxed.
It doesn't have so much to do with what's in your system upon impact, it's how your body handles the impact. Someday, I will do a study to see how being drunk upon impact has actually saved lives. Of course, I'll have to get funding from the booze companies, as the results would not be PC. Which doesn't mean I'm advocating drunk driving!