Subject: Is effect of second-hand smoke overrated?

I am interested in the effect of the secondary or second-hand smoke on the 
developement of lung cancer and other related illness in a person that 
does not smoke. Recent articles have not been able to establish evidence 
to the dangers of secondary smoking. So is it a myth??

Also, is possible, what evidence is there to show that continual parental 
smoking may contribute to retarded development of the child?
I know that maternal smoking of a neonatal did not contribute any 
significant deterioration in the child's mental state is she stops before 
the baby turns 2. is this true?

Re: Is effect of second-hand smoke overrated?