title: [Use of cannabis among adolescents and young adults in Norway].
abstract: BACKGROUND
  Even occasional use of cannabis may increase the risk of serious mental disease (e.g. schizophrenia). Little has been known about the use of cannabis in Norway; especially among adults.
  
  
  METHODS
  A representative sample of young men and women were followed up from they were in their teens in 1992 until they were young adults in 2005. During this 13-year period they were asked four times (through a questionnaire) about use of cannabis, their education, job status, income, marital status, parenthood and parental education and social class.
  
  
  RESULTS
  In the mid teens (15 - 16 years), less than 10 % had used cannabis. However, a rather high proportion had their debut in their late teens, as well as throughout their twenties. At the end of the twenties, 40 % of the men and 29 % of the women had used cannabis at some point, and 18 % of the men and 8 % of the women had used cannabis during the previous 12 months. Among the users, 70 % had used the substance 1 - 10 times the last 12 months, while 30 % had a more frequent pattern of use. During the teenage years, there were no associations with parental social class. However, during the twenties, the recruitment base of cannabis use increasingly became socially marginal men who lived aloe and had little education.
  
  
  CONCLUSIONS
  Use of cannabis is currently rather prevalent in groups of young adults in Norway, in particular among men. The future incidence of psychosis and schizophrenia may be affected by this.
authors.affiliation: Institutt for sosiologi og samfunnsgeografi Universitetet i Oslo Postboks 1096 Blindern 0317 Oslo. willy.pedersen@sosiologi.uio.no
authors.forename: Willy
authors.initials: W
authors.lastname: Pedersen
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D002189:Marijuana Abuse / Q000150:complications / Q000453:epidemiology* / Q000523:psychology; D008385:Marijuana Smoking / Q000009:adverse effects / Q000453:epidemiology* / Q000523:psychology; D009664:Norway / Q000453:epidemiology; D015995:Prevalence; D012307:Risk Factors; D012959:Socioeconomic Factors; D011795:Surveys and Questionnaires