title: Do pregnant women who report a reduction in cigarette consumption consume less tobacco?
abstract: OBJECTIVE
  To investigate the relationship between changes in self-reported cigarette consumption and changes in serum thiocyanate among pregnant and non-pregnant women who participated in a smoking cessation trial.
  
  
  METHODS
  Intervention study.
  
  
  METHODS
  General practitioners in western Norway.
  
  
  METHODS
  146 pregnant and 102 non-pregnant women who were daily smokers at inclusion. Self-reported cigarette consumption and serum thiocyanate were recorded at inclusion and after 12 months.
  
  
  RESULTS
  Women who smoked in the first trimester of pregnancy reported 21% less cigarette consumption than non-pregnant women. This was in accordance with the serum thiocyanate values. Twelve months later the mean values of serum thiocyanate had increased irrespective of whether the postpartum women reported that they had reduced, increased, or not changed their cigarette consumption. However, among those who reported that they had stopped smoking, analyses of serum thiocyanate confirmed their statements, with very few exceptions. Among nonpregnant women, the serum thiocyanate changed in accordance with the reported changes in cigarette consumption in all groups.
  
  
  CONCLUSIONS
  Women smoking daily in the first trimester of pregnancy had a lower exposure to tobacco than daily smoking non-pregnant women. Twelve months later (six months after delivery) analyses of serum thiocyanate indicated that postpartum women underestimated their tobacco consumption.
authors.affiliation: Department of Public Health and Primary Health Care, University of Bergen, Norway.
authors.forename: K
authors.initials: K
authors.lastname: Haug
authors.forename: O P
authors.initials: OP
authors.lastname: Foss
authors.forename: J M
authors.initials: JM
authors.lastname: Kvamme
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D010349:Patient Compliance; D049590:Postpartum Period; D011247:Pregnancy / Q000097:blood*; D011261:Pregnancy Trimester, First; D012907:Smoking / Q000097:blood*; D016540:Smoking Cessation; D013861:Thiocyanates / Q000097:blood*
chemical_list: D013861:Thiocyanates