well pushing out toxins is one thing, but that all depends on how long it's been since you've made the swap, if it was a recent swap and a recent trip as well, you got hit with a double whammy.
simply put: unless you're from a humid climate, it takes some time getting used to the thick air...i live in new orleans myself...and we can chew the air up with a side of coleslaw and call it lunch it's so thick and humid...but i'm used to it.
contrarily, on a trip i took to denver awhile back, i couldn't get enough oxygen out of the thin air there...i was NOT used to that.
so in summary, you were not used to the humid climate, that's one of the problems there, the other is the possibility of vaping (which causes you to take a deep breath) had you pulling in MORE than the necessary amounts of oxygen, plus with vaping taking away some of the moisture in the air entering your lungs, you were getting a huge abundance of oxygen, causing free radical oxygen particles to form, and causing things to start oxidizing in your bloodstream, in short, get some more antioxidants in your diet when you're in those kind of environments again, and see if there are results there, if not, then the only other thing i could do is tell you to go see a doctor man.