Yes...although its possible its the nicotine, im not thinking it is....but i will try today without any nicotine
It might not be.
But it's good to try and Find a Common item in the things that are causing Problems.
I saw a Thread once where a person New to DIY was getting Headaches from All Her Mixes. People suggested all kinds of things. Nothing seemed to work. Turns out the Sweetener was Common to all Her Recipes. And once she Switched (and Lowered the % level) the Sweetener, her Headaches went away.