Children are at risk of health problems due to inhaling their parents' smoke in confined spaces, according to a recent report.
Conducted by the Royal College of Physicians and the Tobacco Advisory Group, the study revealed that around 300,000 children are taken to see a doctor every year due inhaling smoke passively.
However, Martin Dockrell, director of research and policy at Action on Smoking and health, said that attitudes are beginning to change.
"Over the last five years we have seen a tremendous increase in smoke free homes," he commented.
He added that an increasing number of smokers believe that it is important not to smoke in areas where their children will be exposed to the activity.
This becomes especially important as "there is good evidence that children whose parents smoke at home are significantly more likely to start to smoke".