title: Longitudinal patterns of youth access to cigarettes and smoking progression: Minnesota Adolescent Community Cohort (MACC) study (2000-2003).
abstract: OBJECTIVE
  To measure community-level changes in the methods youth use to obtain cigarettes over time and to relate these methods to the progression of smoking.
  
  
  METHODS
  We analyzed 2000-2003 data from the Minnesota Adolescent Community Cohort study, where youth (beginning at age 12), who were living in Minnesota at baseline, were surveyed every 6 months via telephone. We conducted mixed model repeated measures logistic regression to obtain probabilities of cigarette access methods among past 30-day smokers (n=340 at baseline).
  
  
  RESULTS
  The probability of obtaining cigarettes from a commercial source in the past month declined from 0.36 at baseline to 0.22 at the sixth survey point while the probability of obtaining cigarettes from a social source during the previous month increased from 0.54 to 0.76 (p for both trends=0.0001). At the community level, the likelihood of adolescents obtaining cigarettes from social sources was inversely related to the likelihood of progressing to heavy smoking (p<0.001).
  
  
  CONCLUSIONS
  During this time, youth shifted to greater reliance on social sources and less on commercial sources. A trend toward less commercial access to cigarettes accompanied by an increase in social access may translate to youth being less likely to progress to heavier smoking.
authors: Healthy Youth Development Prevention Research Center, Division of Adolescent Health and Medicine, University of Minnesota, MN 55455-200, USA. widome@umn.edu
authors: Rachel
authors: R
authors: Widome
authors: Jean L
authors: JL
authors: Forster
authors: Peter J
authors: PJ
authors: Hannan
authors: Cheryl L
authors: CL
authors: Perry
mesh_terms: D000293:Adolescent; D015331:Cohort Studies; D003430:Cross-Sectional Studies; D018450:Disease Progression; D005260:Female; D006293:Health Promotion / Q000331:legislation & jurisprudence; D006306:Health Surveys; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008910:Minnesota; D033242:Minors / Q000331:legislation & jurisprudence*; D012907:Smoking / Q000453:epidemiology* / Q000331:legislation & jurisprudence*; D016540:Smoking Cessation; D000074606:Smoking Prevention; D012932:Social Facilitation; D014029:Tobacco Use Disorder / Q000453:epidemiology* / Q000517:prevention & control
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