title: [E-cigarettes should be considered for therapy-resistant smoke-induced COPD].
authors.forename: Stefan
authors.initials: S
authors.lastname: Willers
mesh_terms: D066300:Electronic Nicotine Delivery Systems; D006801:Humans; D029424:Pulmonary Disease, Chronic Obstructive / Q000209:etiology / Q000628:therapy*; D012907:Smoking / Q000009:adverse effects; D016540:Smoking Cessation / Q000379:methods*