In the short term, the greatest risk is for people that already have respiratory problems or asthma. Anything that lessens the oxygen they get or triggers a response from their lungs could cause a series of more serious medical problems.
In the long term, exposure to smoke and smog can cause the development of asthma and damage to lungs. There are also numerous other problems which can be hard to predict. But basically breathing anything other than normal unaltered air for any amount of time is not good for you.
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