How much vodka can someone drink?

Someone will drink all of it, if you don't watch out.

Depends on the person, how fast you drink, weight, other factors, etc. Bottom line, there's no reason to push it; it doesn't make you look cool.... to anyone except the other silly kids trying to out-drink each other.

As much as they want.

Lol, keep drinking and find out. No, for real, I doubt you've had 16 shots, unless you mean over a long period of time. Go back to beer, sounds safer for you.

Depends on how fast you drink them. Small people can get drunk off a few shots, some people (like me) it takes over a dozen to get really drunk (6'1, 235). However, the rate you drink them is most important. 1 or 2 per hour after a few, you'll just be riding a buzz all night. Hammer 8+ down in a row and you'll feel fine for about half an hour, and then it'll feel like getting kicked by a mule. The danger comes when you are drunk enough to not care about how much you are drinking, and then all of a sudden realize that you've stopped drinking (even an hour before) but are still getting more and more drunk because your body is still trying to process that alcohol. I've had that problem numerous times, and gotten rolled so hard that I couldn't touch that kind of alcohol again for years (I still have trouble with jollyrancher vodka). My event involved an entire jar of strawberry moonshine, which I started on just after having a beer and a few shots of something else, and within an hour or so, I was wondering why a full bottle of 120 proof alcohol was missing. Bad night. Really though, I wouldn't test how much you can drink before you get sick, as that's just a recipe for disaster, blackouts, hangovers, and life-ruining events. If you are going to drink, do it responsibly like adults do.