CIRC -

"Exposure to Parental Smoking in Childhood Is Associated With Increased Risk of Carotid Atherosclerotic Plaque in Adulthood"

"Conclusions—Children of parents who smoke have increased risk of developing carotid atherosclerotic plaque in adulthood. However, parents who exercise good smoking hygiene can lessen their child’s risk of developing plaque."

http://circ.ahajournals.org/content/131/14/1239.full