We've all known that secondhand smoke is dangerous, but now, a study shows that children exposed to it, face health problems that may last into adulthood.

Previous research has shown a link between living with parents who smoke and respiratory illnesses in childhood. Now, University of Arizona researchers found these health problems often persist into adulthood-- even if these people never pick up a nicotine habit.

Although parental smoking did impact asthma and wheezing in adulthood-- there was a stronger association with chronic cough.