There is a good article on this at healthline
https://www.healthline.com/health/alcoholism/congeners
Basically, there are things other than ethanol in your drinks.
In the discussion of “what is in your drink?”, they call these things “**congeners**”.
>Examples of congeners the distillation process makes include:
* acids
* alcohols, such as isobutylene alcohol, which smells sweet
* aldehydes, such as acetaldehyde, which often has a fruity smell present in bourbons and rums
* esters
* ketones
>The amount of congeners present in alcohol can vary. As a general rule, the more distilled a spirit is, the lower the congeners.
>**This is why some people may find that “top shelf” liquors that are highly distilled don’t give them a hangover as much as a lower-priced alternative.**
This is an important bit.
>**drinking alcoholic beverages that have more congeners usually causes a worse hangover than drinks with fewer congeners.**
In university, we “liberated” a 50 gallon drum of medical grade (95%) ethanol.
Never a hangover in spite of some excessive drinking.
This was interesting
>Researchers currently believe a hangover is the result of many contributing factors, including:
* how much a person drank
* sleep duration
* sleep quality
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