While the act of carrying a vape in your carry-on is legal under aviation safety rules, you can get into severe trouble depending on your destination or your behavior. It is a federal crime to vape or charge your device onboard an aircraft; doing so can lead to emergency landings, massive fines, and permanent airline bans. Furthermore, vaping is completely illegal in several countries. If you fly into countries like Thailand, Singapore, India, or Taiwan with a vape, you risk having the device seized, paying heavy fines, or even facing imprisonment. For example, in Thailand, possession of a vape can lead to up to 10 years in prison. Even in countries where vaping is legal, carrying THC or CBD vapes across international borders is extremely dangerous and can be classified as drug trafficking, even if the substance is legal in your departure city. Always check the specific laws of your destination country before packing any vaping device or e-liquid for an international trip.