In an age where a multitude of THC edibles, tinctures, pills, sublinguals and vaporizers are available (where it's legal, of course) anyone smoking an actual joint on a ship is just plain stupid. THC extract, when vaped, does not smell like WEED (I feel obligated to capitalize it now). Edibles have no pot smell at all and can be consumed without offending other passengers. There is simply no need to smoke actual flower on a ship.