There is an ingredient that is used in some juices that makes me feel quesy. I haven't pinned it down yet, and vendors are not about to give up the recipe. Since I DIY, I have bought a bunch of additives commonly used, and am hoping to find it so in the future I can always ask if it is used should I find myself buying vendor juice.
I would lower the nic though, 24 is a bit high to chain vape with and could also be causing you some discomfort. I dropped to 16 - 18 mg and no longer get the headaches I was getting from the high nic. As if that wasn't enough, I also have a problem with high PG. It makes me feel "congested" with a heavy throat feel. I found it uncomfortable. If I vape below 50% PG, I don't have issues but prefer 30 PG/70 VG.
Over time, you will figure out your preferred blend and what you like best. I wouldn't throw out that cupcake until you can determine what is really going on. It doesn't go bad for a LONG time, I think premixed is a year. I have been able to salvage some of mine by adding VG to it. The flavor was muted, the nic was down and I was fine. I got to enjoy a taste of it again
