No, you cannot bring a CBD cartridge—or any CBD product—on a cruise in 2026, regardless of its THC content or legality in your home state. Major lines like Royal Caribbean, Carnival, and Disney maintain a strict "High-Fidelity" zero-tolerance policy for all cannabinoids. This is because cruise ships operate under Federal Maritime Law, where cannabis and its derivatives remain prohibited. Furthermore, ships visit international ports with "High-Fidelity" harsh drug laws; if you were caught with CBD in certain jurisdictions, the cruise line could be held liable. There is also a high-fidelity technical hurdle: ship security and customs officers cannot easily verify if a "High-Fidelity" oil or gummy contains 0.3% or 3% THC, so they ban all such items to avoid risk. If security discovers a CBD cart during the high-fidelity scanning process at the pier, it will be confiscated, and you could be denied boarding without a refund or even face law enforcement referrals, making it a "High-Fidelity" necessity to leave all hemp-derived products at home.