Bringing drugs onboard is not advised. But I'm tired to people saying that your life is screwed up and that drugs are all bad all the time. People use drugs recreationally and have a great time doing it and are in control. No one says anything about all the fat people eating and eating and eating on these ships. Food kills alot more poeple in the long run then drugs when you look at cancers and other health related illnesses arising from poor eating.
You can take the risk of bring drugs onboard but be smart about it. Don't keep it in your bags where the dogs will smell it. Keep it up and away from the dogs. Don't smoke your weed where it will bother others. Find a quite place on the ship where no one is and enjoy it there. There is a ton of places where no one is outside at nighttime.