Cigarettes are better for performance than checking if your QB is on top of his game and can actually throw ball good under pressure.

I mean, they are technically a stimulant. Idk if I'd trade the best coach in college football for a fatty at halftime, but there's definitely some kind of impact on your performance.

before you would only sub a QB if he's already fucking up instead of checking to do it before he fucks up

A big part of the coaching game is distinguishing between when your game plan failed and when your players did. Talking to the QB afterwards and figuring out what went wrong is kinda vital to that process.

Of course, you could always just jam a needle full of adrenaline into the guy's chest and send him back out there. Some people just coach different.