title: Beliefs about the health effects of "thirdhand" smoke and home smoking bans.
abstract: OBJECTIVE
  There is no safe level of exposure to tobacco smoke. Thirdhand smoke is residual tobacco smoke contamination that remains after the cigarette is extinguished. Children are uniquely susceptible to thirdhand smoke exposure. The objective of this study was to assess health beliefs of adults regarding thirdhand smoke exposure of children and whether smokers and nonsmokers differ in those beliefs. We hypothesized that beliefs about thirdhand smoke would be associated with household smoking bans.
  
  
  METHODS
  Data were collected by a national random-digit-dial telephone survey from September to November 2005. The sample was weighted by race and gender within Census region on the basis of US Census data. The study questions assessed the level of agreement with statements that breathing air in a room today where people smoked yesterday can harm the health of children.
  
  
  RESULTS
  Of 2000 eligible respondents contacted, 1510 (87%) completed surveys, 1478 (97.9%) answered all questions pertinent to this analysis, and 273 (18.9%) were smokers. Overall, 95.4% of nonsmokers versus 84.1% of smokers agreed that secondhand smoke harms the health of children, and 65.2% of nonsmokers versus 43.3% of smokers agreed that thirdhand smoke harms children. Strict rules prohibiting smoking in the home were more prevalent among nonsmokers: 88.4% vs 26.7%. In multivariate logistic regression, after controlling for certain variables, belief that thirdhand smoke harms the health of children remained independently associated with rules prohibiting smoking in the home. Belief that secondhand smoke harms the health of children was not independently associated with rules prohibiting smoking in the home and car.
  
  
  CONCLUSIONS
  This study demonstrates that beliefs about the health effects of thirdhand smoke are independently associated with home smoking bans. Emphasizing that thirdhand smoke harms the health of children may be an important element in encouraging home smoking bans.
authors.affiliation: Center for Child and Adolescent Health Policy, Massachusetts General Hospital, Boston, MA 02114, USA. jwinickoff@partners.org
authors.forename: Jonathan P
authors.initials: JP
authors.lastname: Winickoff
authors.forename: Joan
authors.initials: J
authors.lastname: Friebely
authors.forename: Susanne E
authors.initials: SE
authors.lastname: Tanski
authors.forename: Cheryl
authors.initials: C
authors.lastname: Sherrod
authors.forename: Georg E
authors.initials: GE
authors.lastname: Matt
authors.forename: Melbourne F
authors.initials: MF
authors.lastname: Hovell
authors.forename: Robert C
authors.initials: RC
authors.lastname: McMillen
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D016902:Air Pollution, Indoor / Q000009:adverse effects / Q000517:prevention & control; D003430:Cross-Sectional Studies; D003469:Culture; D005191:Family Characteristics; D005260:Female; D006304:Health Status; D006801:Humans; D008297:Male; D008875:Middle Aged; D012307:Risk Factors; D012907:Smoking / Q000009:adverse effects / Q000453:epidemiology*; D016540:Smoking Cessation / Q000379:methods; D000074606:Smoking Prevention; D014028:Tobacco Smoke Pollution / Q000517:prevention & control*; D055815:Young Adult
chemical_list: D014028:Tobacco Smoke Pollution