Yes, you can bring a vape pen on a Carnival cruise, but you must adhere to incredibly strict usage and transport policies in 2026. Carnival treats electronic cigarettes and personal vaporizers exactly like traditional tobacco products. You are strictly prohibited from vaping in your stateroom or on your private balcony; doing so will result in a $500 "Room Recovery Fee" and potential disembarkation. Vaping is only permitted in designated outdoor smoking areas and in specific sections of the casino while actively gaming. For transport, you must keep the device and its lithium batteries in your carry-on bag at all times; they are banned from checked luggage for fire safety reasons. A vital 2026 warning: if your cruise stops in Mexico (e.g., Cozumel or Costa Maya), Mexican law now strictly prohibits the import of any vaping devices. Carrying one off the ship can lead to fines exceeding $12,000 or imprisonment. A supportive peer tip is to leave your device in your stateroom safe during all Mexican shore excursions to avoid a "legal nightmare" with local customs.