Second hand smoke: Second hand smoke is a significant trigger for asthma and should be avoided whenever possible.
Answered 7/4/2013
5k views
Aggravate yes: Second hand smoke can trigger an asthma event, or unmask a person's condition if they have undiagnosed asthma. It does not "cause" asthma in any true sense.
Answered 11/5/2017
488 views
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