There are no clear regulations on the number of vapes that can be carried on international flights. However, in order to ensure flight safety and comply with relevant laws and regulations, it is recommended that you do not use unauthorized vape products when taking international flights. At the same time, you also need to pay attention to the following points:
1. Comply with airline regulations: Different airlines may have different regulations on items carried by passengers, so you need to read the relevant regulations carefully before taking an international flight and declare as required.
2. Pay attention to the battery capacity: Some vape products use lithium batteries. If your vape uses lithium batteries, you need to pay attention to whether its capacity complies with airline regulations.
3. Safety first: Whether on domestic or international flights, you should always put safety first, abide by the regulations at the airport and on the aircraft, and avoid any safety hazards.
In short, if you want to take vape products on an international flight, be sure to understand the relevant regulations in advance and be prepared.