Smoking bans responsible for decline in childhood asthma and premature births

This is one of many articles published 
in the last 24 hours on this subject 
concerning changes in health from 
smoking bans. A total of eleven studies
from Europe and North America smoking
bans resulted in a 10% reduction in 
childhood asthma and premature birth.
BBC: Smoking bans cut child asthma and premature birth by 10%