title: Environmental tobacco smoke exposure during travel among adults with asthma.
abstract: OBJECTIVE
  In California, state law now prohibits smoking in most public places. We examined the prevalence and short-term health impact of environmental tobacco smoke (ETS) exposure during travel among adults with asthma.
  
  
  METHODS
  A cohort of 374 nonsmoking adults with asthma recruited from a random sample of allergy, pulmonary, and family practice physicians in northern California underwent structured telephone interviews.
  
  
  RESULTS
  The prevalence of self-reported ETS exposure during travel in the past 12 months was substantial (30%; 95% confidence interval, 25 to 35%). Of the exposed subjects, approximately one third (34%) indicated no other regular source of ETS exposure. ETS-related cough, wheezing, or chest tightness during travel was the most common complaint (66%), followed by eye irritation (46%) and nose irritation (43%). After ETS exposure, many subjects indicated extra inhaled asthma medication use (55%). Subjects with no other regular ETS exposure reported a greater likelihood of eye irritation (58% vs 40%; p = 0.068) and nose irritation (58% vs 36%; p = 0.025) than persons with regular exposure. In contrast, there were no differences in respiratory symptoms, asthma medication use, or asthma exacerbation by regular ETS exposure status.
  
  
  CONCLUSIONS
  In adults with asthma, ETS exposure is common during travel. For many subjects, travel is their principal source of exposure.
authors.affiliation: Division of Occupational and Environmental Medicine, Department of Medicine, University of California, San Francisco, 94117, USA. eisner@itsa.ucsf.edu
authors.forename: Mark D
authors.initials: MD
authors.lastname: Eisner
authors.forename: Paul D
authors.initials: PD
authors.lastname: Blanc
mesh_terms: D000328:Adult; D001249:Asthma / Q000453:epidemiology / Q000209:etiology*; D002140:California; D015331:Cohort Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012307:Risk Factors; D014028:Tobacco Smoke Pollution / Q000009:adverse effects* / Q000706:statistics & numerical data; D014195:Travel
chemical_list: D014028:Tobacco Smoke Pollution