well it depends, if you're in a large city (NYC and cali in particular, also probably texas, and maybe the midwest more generically. If you live in the EU you're probably just fucked. Africa ironically might be perfectly fine), you're probably dying instantly. If you live in the middle of nowhere land, you're probably far enough out that you won't immediately notice it, though everything around you is going to be fucked, and the global economy will collapse pretty much immediately.

neither putin, nor mr winnie the pooh of china land (whose name i can never spell or remember) will want the global economic collapse, north korea probably wouldn't care, but they would all starve immediately, so.

Basically the entire civilization of earth in regards to nuclear warfare is a precarious game of jenga, and if anything gets upset, the entire thing comes crashing down. And as a result, it's so unlikely that anything will happen, that it might as well be a zero.

More than likely, if nuclear war WERE to happen, the global economy would have already collapsed, the military forces of the world will probably all be skirmishing constantly, and people will not be doing well to begin with. So by the time you have to worry about a nuclear war, you'll either be dead, or so focused on not dying it probably won't matter anymore.

nuclear warfare is kind of like the street fight equivalent of bringing a pipe bomb. A little silly, but i don't think it's ever happened.