(June 7, 2023) Although illegal, the distinct odor of marijuana can sometimes be smelled while cruising. Carnival Cruise Lines has begun using dogs at Florida ports to help find the drug in luggage during embarkation. If you have taken THC or CBD on cruises in the past, be careful now when boarding Carnival. Carnival authorities did not say if they would destroy the weed or hold it until disembarkation at the end of the cruise.