There are offences for smoking in a smoke-free vehicle, for not displaying signs when required to and also for failing to prevent smoking.
Mae yna droseddau’n ymwneud â smygu mewn cerbyd di-fwg, troseddau’n ymwneud â pheidio ag arddangos arwyddion pan fo hynny’n ofynnol, yn ogystal â throseddau’n ymwneud â methu ag atal smygu.