No, you cannot smoke a vape pen in your cabin, on your balcony, or in most public areas of a cruise ship in 2026. Almost all major lines (Carnival, Royal Caribbean, NCL) treat vaping exactly like cigarette smoking. It is strictly limited to designated smoking areas, which are usually located on a specific section of an outer deck or in a designated cigar lounge/casino area. Vaping in your room will trigger high-sensitivity smoke detectors, leading to a "cleaning fee" of $250–$500 and potential removal from the ship. A critical 2026 update: if your cruise stops in Mexico, a new law enacted in early 2026 bans the importation of vapes. While you can vape on the ship in designated areas, taking a vape pen ashore in Mexico can lead to immediate confiscation, massive fines (up to $12,000), and even detention by Mexican customs officials.