Smoking Before Fatherhood May Raise Asthma Risk in Kids: Study

"...The results showed that asthma was much more common in children whose fathers were smokers before conception. A child's risk of asthma increased if the father smoked before age 15, and the risk grew the longer the father smoked..."

http://www.philly.com/philly/health/topics/HealthDay691392_20140908_Smoking_Before_Fatherhood_May_Raise_Asthma_Risk_in_Kids__Study.html