title: Reasons for recent marijuana use in relation to use of other illicit drugs among high school seniors in the United States.
abstract: OBJECTIVE
  Studies show that illicit cannabis (marijuana) use is related to use of other illicit drugs and that reasons for use are related to frequency of marijuana use. However, research is needed to examine whether specific reasons for marijuana use are associated with use of other illicit drugs.
  
  
  METHODS
  Data from recent marijuana-using high school seniors were examined from 12 cohorts of Monitoring the Future (Weighted n = 6481) to examine whether reasons for recent marijuana use are associated with use of eight other illicit drugs.
  
  
  RESULTS
  Using "to experiment" decreased odds of reporting use of each drug and using to decrease effects of other drugs increased odds of reporting use of each drug. In multivariable models, using marijuana "to experiment" decreased the odds for reporting use of hallucinogens other than LSD and narcotics other than heroin. Using marijuana for "insight" increased the odds for use of hallucinogens other than LSD, and use due to "boredom" increased the odds for reporting use of powder cocaine and hallucinogens other than LSD. Using marijuana to increase effects of other drugs increased odds of reporting use of each of the eight drugs, and using it to decrease other drug effects increased odds of reporting use of crack, hallucinogens other than LSD, and amphetamine/stimulants.
  
  
  CONCLUSIONS
  This study helped identify illicit marijuana users who are more likely to report use of other illicit drugs. Prevention efforts need to focus on students who report certain reasons for marijuana use as they may be at risk for use of other illicit drugs.
authors.affiliation: Department of Population Health, New York University Langone Medical Center , New York , NY .
authors.forename: Joseph J
authors.initials: JJ
authors.lastname: Palamar
authors.forename: Marybec
authors.initials: M
authors.lastname: Griffin-Tomas
authors.forename: Dimitra
authors.initials: D
authors.lastname: Kamboukos
mesh_terms: D000293:Adolescent; D019969:Amphetamine-Related Disorders / Q000453:epidemiology / Q000209:etiology; D019970:Cocaine-Related Disorders / Q000453:epidemiology / Q000209:etiology; D016578:Crack Cocaine; D005260:Female; D006556:Heroin Dependence / Q000453:epidemiology / Q000209:etiology; D006801:Humans; D016015:Logistic Models; D008238:Lysergic Acid Diethylamide; D008297:Male; D002189:Marijuana Abuse / Q000453:epidemiology / Q000209:etiology*; D009293:Opioid-Related Disorders / Q000453:epidemiology / Q000209:etiology; D012574:Schools / Q000706:statistics & numerical data; D013334:Students / Q000523:psychology / Q000706:statistics & numerical data*; D019966:Substance-Related Disorders / Q000453:epidemiology / Q000209:etiology*; D014481:United States / Q000453:epidemiology; D055815:Young Adult
chemical_list: D016578:Crack Cocaine; D008238:Lysergic Acid Diethylamide
keywords: Adolescents; high school; marijuana; reasons for drug use; substance abuse