title: Does switching to reduced ignition propensity cigarettes alter smoking behavior or exposure to tobacco smoke constituents?
abstract: BACKGROUND
  Since 2004, several jurisdictions have mandated that cigarettes show reduced ignition propensity (RIP) in laboratory testing. RIP cigarettes may limit fires caused by smoldering cigarettes, reducing fire-related deaths and injury. However, some evidence suggests that RIP cigarettes emit more carbon monoxide and polycyclic aromatic hydrocarbons, and smokers may alter their smoking patterns in response to RIP cigarettes. Both of these could increase smokers' exposures to harmful constituents in cigarettes.
  
  
  METHODS
  An 18-day switching study with a comparison group was conducted in Boston, MA (N = 77), and Buffalo, NY (N = 83), in 2006-2007. Current daily smokers completed 4 laboratory visits and two 48-hr field data collections. After a 4-day baseline, Boston participants switched to RIP cigarettes for 14 days, whereas Buffalo participants smoked RIP cigarettes throughout. Outcome measures included cigarettes smoked per day; smoking topography; salivary cotinine; breath CO; and hydroxylated metabolites of pyrene, naphthalene, phenanthrene, and fluorene. Because the groups differed demographically, analyses adjusted for race, age, and sex.
  
  
  RESULTS
  We observed no significant changes in smoking topography or CO exposure among participants who switched to RIP cigarettes. Cigarette use decreased significantly in the switched group (37.7 cigarettes/48 hr vs. 32.6 cigarettes/48 hr, p = .031), while hydroxyphenanthrenes increased significantly (555 ng/g creatinine vs. 669 ng/g creatinine, p = .007). No other biomarkers were significantly affected.
  
  
  CONCLUSIONS
  Small increases in exposure to phenanthrene among smokers who switched to RIP versions were observed, while other exposures and smoking topography were not significantly affected. Toxicological implications of these findings are unclear. These findings should be weighed against the potential public health benefits of adopting RIP design standards for cigarette products.
authors.affiliation: Department of Health Behavior, Division of Cancer Prevention and Population Sciences, Roswell Park Cancer Institute, Elm and Carlton Streets, Buffalo, NY 14263, USA. richard.oconnor@roswellpark.org
authors.forename: Richard J
authors.initials: RJ
authors.lastname: O'Connor
authors.forename: Vaughan W
authors.initials: VW
authors.lastname: Rees
authors.forename: Kaila J
authors.initials: KJ
authors.lastname: Norton
authors.forename: K Michael
authors.initials: KM
authors.lastname: Cummings
authors.forename: Gregory N
authors.initials: GN
authors.lastname: Connolly
authors.forename: Hillel R
authors.initials: HR
authors.lastname: Alpert
authors.forename: Andreas
authors.initials: A
authors.lastname: Sjödin
authors.forename: Lovisa
authors.initials: L
authors.lastname: Romanoff
authors.forename: Zheng
authors.initials: Z
authors.lastname: Li
authors.forename: Kristie M
authors.initials: KM
authors.lastname: June
authors.forename: Gary A
authors.initials: GA
authors.lastname: Giovino
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012907:Smoking / Q000453:epidemiology*; D016540:Smoking Cessation; D055815:Young Adult
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