Experts say fewer children are developing asthma as a result of the smoking ban.
Bans on smoking in public places have caused a large drop in rates of child asthma.
Experts at the University of Edinburgh analysed 11 studies dating back to 1975.
They found rates of premature birth and hospital attendance for asthma were reduced by 10% within a year of smoke-free laws coming in.
Amanda Sandford from anti-smoking group ASH says it's not just children's health that's improved
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