Does vodka have an extra-strong affect on me, or am I just a super-mega-lightweight?!

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You are a super-mega-lightweight!!!!!!!!!!!!

Come on man give yourself a break. So it was a strongly intoxicating experience. It may have also kick your butt. So what!, it happens to us all at some time. So many things could have come into play from not eating that day too having a low concentration of Alcohol dehydrogenases. It may be that vodka had just a bit more alcohol than the beers you may normally drink. But really you are just 115# which is a smaller mass. For a man your weight that is about a 0.09 (0.10) and for a female 0.11 (0.12) which is a fairly good buzz. Let it ride now so you can ride another day.

The brand does matter. Cheap alcohol is more likely to give you a hangover. Greey Goose, Absolut, Belvedere are better higher quality brands. Stick to those. Most beer have about 3-5% alcohol in it whereas Vodka would have about 40% so you also have to to look at the difference in alcohol percentage.

Professional Drinker

It's the quality of the vodka. You could have imbibed the same amount of Grey Goose and wouldn't be suffering as you are now. Always buy the best you can afford, never drink more than 1 type of drink in an evening and drink a glass of water between cocktails and you will be fine

at 115lbs im about the same and by 3.5 shots im well past tipsy as well. i usually have multiple drinks up until i go to sleep but it usually sticks with me for quite a while. the only time i had just one drink-2.5 shots in a 16 oz glass of fruit juice, i could still feel it for a good two hours afterward, im a light weight though...4, 4% alcohol parrot bay daiquiris has me drunk....

The proof of alcohol content in your vodka is probably the reason. Some vodka has 90 proof which means 90 percent alcohol.

Beer isn't that high of a percentage...
Read the bottle first, then decide how many you need ;)

Vodka just has a strong affect on you, im 150m pounds and can slam 10 shots of vodka and not feel a thing but when i drink a bottle of champagne or wine i get drunk real easy.

Twist in your lightbulb five times, and that should keep Mr.Corcoran off of his students. And make him less likely to constantly think: to grope or not to grope? but it might give him a *****...

The proof number of an alcoholic drink is double the percentage of alcohol. So a 90 proof vodka would be 45% alcohol, not 90%.

80 proof (40% abv) is standard for vodka, but stronger ones are available. So it could be that you drank something extra strong without realizing it.

It also could be that you really are just affected more by vodka. I can hold vodka pretty well, but whisky kills me.

Added:
One other thing to consider is that if you poured your vodka by eye, then you very likely over-poured. Beer comes in single-serving cans/bottles, so you know they are always 1 standard drink each. But with vodka, unless you used a shot glass to measure, you very likely put more than 1 standard drink's worth (a single shot) into your drinks. Thus, your three vodka drinks may have actually been 5 or whatever.