I’ve noticed that drinking white spirits gives me a lesser hangover than darker liquors, you’ve probably noticed the same.
According to a recent study some hangovers are worse than others because some drinks contain more congeners, the substance that make your drinks colourful and flavourful.
It is believed this substance is what causes the hangover. Basically the additives to either the alcohol or mixer may be to blame for the hangover intensity. Find out more at http://www.huffingtonpost.com.au/2016/06/25/the-reason-some-alcohol-makes-you-more-hungover-than-others/