| http://www.w3.org/ns/prov#value | - Note: ref = reference group. *Adjusted for age, sex, ethnic background, body mass index, education, asthma and other comorbidities (i.e., heart disease, hypertension, stroke, diabetes and tuberculosis) and interaction terms for concurrent smoking of marijuana and tobacco (p = 0.001 for COPD defined by spirometric testing, p = 0.283 for COPD defined by self-reported symptoms, and p < 0.001 for COPD
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