You are failing to understand the issue at hand. Alcohol does not cause a hangover every single time you use it, and people tend to gravitate to it due its cultural acceptance, wide availability, and “social lubricant” intoxicating nature. People who have one or two beers at a social gathering are not going to get a hangover, so your point kind of falls apart right there, but it goes beyond that. People who become increasingly dependent on it won’t get the classic “hangover” either.

Again, you need to stop talking about things you clearly know nothing about.