The charity is launching its Children's Charter campaign to the media at the Science Museum later today.
As part of the campaign, the BLF commissioned a survey of 1,000 parents on social networking site mumsnet.com, and 86% of the sample supported a ban. The research also found that 83% of smoking parents said they would back a ban too.
The Children's Charter sets out 12 points for better care and treatment for children with lung disease and to improve the lung health of children in the UK.
To gather support for a ban on smoking in cars when children under 18 are passengers, the charity has launched a Government petition and hopes to collect over 50,000 signatures by the end of the year.
Dame Helena Shovelton, chief executive of the British Lung Foundation, said: ‘Parents are sending a clear message to the Government that smoking in cars with children under the age of 18 should be banned. Smoking just one cigarette, even with the car window open, creates a greater concentration of second-hand smoke than a whole evening's smoking in a pub or a bar.'
The BLF has also launched a national poster advertising campaign to raise awareness of the dangers of passive smoking in the car. The image pictures a young girl in a car being forced to smoke by an adult and the caption reads ‘When you smoke in the car, they smoke'.