Just a bit more scrutiny. I've traveled from EWR (Newark) to STI (Santiago, Dominican Republic) 3 times back and forth since i started vaping. As jmlott said: "Just be upfront and dont try to hide it.". Yelsew Skraps's method is the recomended: multiple 3.5ml (travel size) in a clear 1 quart ziplock bag, now for anything bigger check with the airline first. If they permit it put in your check-in bags in a ziplock bag inside another ziplock bag, just incase it leaks. Check-in bags get ruffly tossed around.