A new study has found that children who are exposed to second-hand smoke are more likely to wind up in the emergency room. But that situation only occurs under certain circumstances.

Children exposed to a combination of both second-hand cannabis and tobacco smoke are more likely to visit the emergency department than children who were not exposed, or only exposed to one or the other.

"This association was not seen in children exposed to only marijuana smoke or to only tobacco smoke. This is the first study to demonstrate the notable impact between second hand marijuana smoke exposure and child health," the Pediatric Academic Societies - who are publishing the study - said in a statement.

Their research also looked for which group were most likely to develop conditions that can be agitated by smoke, such as asthma, otitis media (inflammatory diseases of the middle ear) and viral respiratory infections. The findings were similar, with the statistics showing that children exposed to both tobacco and cannabis suffered higher rates of otitis media.

Potential health issues like this are the exact reason that states like Colorado have been receiving opposition to social cannabis use from parents who are worried about the effect marijuana smoke could have on their children. The study also lends credence to Vermont Governor Phil Scott's decision to impose strict penalties on people caught smoking up around minors.