The reason why we get sick when mixing alchohol
news.yahoo.com
news.yahoo.com
Interesting fact: in Russian tradition, if people do mix drinks, they usually do it in the opposite direction: from lower alcohol content drink to higher.
It's also not entrainment. My parents and grandparents drink daily, and not in small amounts either, while i drink maybe 6 times or so a year and i have exactly the same kind of quick processing and resistance as they do.
Interestingly it may be related to the fact that my motherly line of ancestors has a lot of east-european blood in it.
This might as well be because you are younger, and thus naturally process alcohol better then they would.
I used to be able to drink a lot and I have never had an hangover until my late twenties even if I got wasted, these days I regularly get it if I drink a bit too much[0].
[0] which might also be habit: I seldom drink much these days, while I did it more often in the past.
I am saying that you might be at tolerance level 8 because your are young, while your parents start at 6 but gain 2 points because of resistance they built up with daily use.
[0] https://en.wikipedia.org/wiki/Alcohol_and_Native_Americans#C...
IMHO the article author should also have googled how different alcohol make your head hurt :)