a hangover isn't strictly correlated to alcohol - you can have a hangover with a 0% alcohol reported by the breathalyzer. I've read drinking alcohol starts proc

a hangover isn't strictly correlated to alcohol - you can have a hangover with a 0% alcohol reported by the breathalyzer. I've read drinking alcohol starts processes that damage the brain for the following 3 weeks, and the brain needs additional 3 weeks to heal. Obviously what people mean by a hangover has a much shorter span, I think mostly related to dehydration.