You can generally bring a vape on a ferry, but you almost certainly cannot use it. In 2026, major operators like BC Ferries, Washington State Ferries, and most European lines have "Smoke-Free" policies that treat e-cigarettes and vapes exactly like traditional tobacco. Use is prohibited on all decks (including outdoor ones), in cabins, and in terminals. Furthermore, for safety reasons related to lithium-ion batteries, many ferries require that vapes remain on your person or in carry-on luggage; they should never be left in a vehicle on the car deck, as the car deck is a high-fire-risk zone where temperatures can fluctuate. If caught vaping, you may be fined or, in some cases, banned from the service, as the vapor can trigger sensitive smoke detection systems in enclosed areas of the ship.