| http://www.w3.org/ns/prov#value | - But few studies have looked at whether other types of smoking contribute to COPD as well.In the new study, researchers found that among more than 3,500 U.S. adults, those who had ever smoked cigars or pipes were more likely than non-smokers to show obstructed airflow - a hallmark of COPD -- during tests of lung function.Of the 56 study participants who said they had smoked at least 20 cigars or pi
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