A new study finds children can suffer from secondhand smoke that seeps through walls or shared ventilation systems.
Compared to kids who live in detached homes, apartment dwelling children have 45 percent more of a certain tobacco chemical in their blood, according to the journal Pediatrics.
The study didn't look at whether the health of the children was compromised.
Researchers say their research supports the efforts of people who have already been moving towards banning smoking in multi-unit housing.
