Laws banning smoking in public places have had a positive impact on child health, an international study in the Lancet suggests.Researchers found a 10% reduction in premature births and severe childhood asthma attacks within a year of smoke-free laws being introduced.
A research team analysed 11 previous studies from North America and Europe.
The Royal College of Obstetricians and Gynaecologists said smoking bans benefitted adults and children.
This is one of the first large studies to look at how anti-smoking laws in different countries and states are affecting the health of children living in those regions.
Laws that prohibit smoking in public places, such as bars, restaurants and workplaces, have already been shown to protect adults from the dangers of passive smoking.
In this study, researchers from the University of Edinburgh, Maastricht University, Hasselt University in Belgium, Harvard Medical School and Brigham and Women’s Hospital looked at more than 2.5 million births and almost 250,000 hospital attendances for asthma attacks in children.
Dr Jasper Been, lead study author from the Maastricht University Medical Centre in The Netherlands, said the research on children under 12 was revealing.
“Our study provides clear evidence that smoking bans have considerable public health benefits for perinatal and child health, and provides strong support for WHO recommendations to create smoke-free public environments on a national level.”
The study also found a 5% decline in children being born very small for their age after the introduction of smoke-free laws.
Co-author Professor Aziz Sheikh, of Brigham and Women’s Hospital, in Boston, Massachusetts, and the University of Edinburgh, said there was potential to improve the health of more children.
“The many countries that are yet to enforce smoke-free legislation should in the light of these findings reconsider their positions on this important health policy question.”
Previous research suggests that 40% of children worldwide are regularly exposed to second-hand smoke, which has been shown to be a cause of respiratory disease and a trigger for asthma attacks in children.
Recent European research also showed that passive smoking causes thickening of children’s arteries which can increase the risk of heart attacks and strokes in later life.
Experts say children are particularly vulnerable to the negative effects of second-hand smoke because their lungs and immune systems are still developing.
At present, 16% of the world’s population is covered by smoke-free laws.
Commenting on the study, Professor Ronnie Lamont from the Royal College of Obstetricians and Gynaecologists said the study provided further evidence that smoking bans had substantial health benefits for adults and children.
“Smoking during pregnancy has been shown to have adverse effects on foetal development and pregnant women need to be informed of the risks and should be offered advice and support to help them give up. It is important that healthcare professionals encourage women to lead a healthy lifestyle.”