Anyone in Wales caught smoking in cars with children on board could soon be fined £50 on the spot.
A six-week consultation on the plans will begin today (September 11), in an attempt to protect those who are under 18 from the dangers of breathing in second-hand smoke, southwestargus.co.uk reports.
Welsh first minister Carwyn Jones said: "Some people light up in their cars without thinking and believe that opening the window will help disperse the smoke...Children cannot escape from the toxic chemicals contained in second-hand smoke when travelling in vehicles."
As a further deterrent to motorists caught smoking while travelling with children, they will also face points on their licence. The new legislation is set to begin in 2015.
Research by Cardiff University has found that ten per cent of Welsh children are exposed to smoke when in cars, with Jones arguing: "Children and young people have the right to breathe clean air and enjoy smoke-free environments."
Mark Drakeford, Wales' health minister, added: "Our aim is to protect the health of children and young people from the harm associated with exposure to second-hand smoke when travelling in private vehicles."
Electronic cigarettes are also part of the consultation and may also be banned when travelling with children, bbc.co.uk notes.