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Initiation of Marijuana Use: Trends, Patterns, and Implications

Table of Contents Table Of Contents

For the PDF version of this report, click here

Cover

List of Figures

List of Tables

Highlights

1. Introduction
1.1 Purpose of the Report
1.2 Background on Marijuana Use and Initiation of Marijuana Use
1.2.1 Recent Trends in Use
1.2.2 Prior Studies of Marijuana Initiation
1.2.3 Research on Seasonality of Substance Use
1.2.4 Predictors of Initiation
1.2.5 Sequencing of Substance Use Initiation
1.2.6 Early Marijuana Use and Later Substance Use Problems

2. Data and Methods
2.1 Data Source
2.2 Limitations of the Data
2.3 Analysis Sample
2.4 Measures and Definitions of the Terms Used in the Report
2.4.1 First Marijuana Use
2.4.2 Social and Demographic Variables
2.4.3 Use of Cigarettes, Alcohol, and Other Drugs
2.4.4 Heavy Use of Illicit Drugs
2.4.5 Dependence on or Abuse of Alcohol and Other Drugs
2.5 Statistical Methods
2.5.1 Incidence Estimation: National
2.5.2 Incidence Estimation: State
2.5.3 Logistic Regression Analyses

3. Trends in Marijuana Incidence
3.1 Introduction
3.2 Trends in Marijuana Incidence
3.3 Trends, by Age and Gender
3.4 Trends, by Race/Ethnicity

4. State Incidence Estimates
4.1 Introduction
4.2 State-Level Estimates of Recent New Marijuana Users

5. Characteristics of Recent Marijuana Initiates
5.1 Prior Research
5.2 Characteristics of Recent Marijuana Initiates
5.3 Seasonality of Incidence
5.4 Logistic Regression Models
5.4.1 Results for Persons Aged 12 to 25
5.4.2 Results for Persons Aged 12 to 14
5.4.3 Results for Persons Aged 15 to 17
5.4.4 Results for Persons Aged 18 to 20
5.4.5 Results for Persons Aged 21 to 25

6. Early Marijuana Use and Later Drug Use Patterns
6.1 Introduction
6.2 Estimated Prevalence of Illicit Drug Use, Heavy Illicit Drug Use, Substance Abuse, and Dependence, by Age of Marijuana Initiation
6.2.1 Use of Heroin, Cocaine, and Psychotherapeutics Nonmedically
6.2.2 Heavy Illicit Drug Use
6.2.3 Substance Dependence and/or Abuse
6.3 Multiple Logistic Regression Models
6.3.1 Adjusted Odds Ratios of Use of Heroin, Cocaine, and Psychotherapeutics Nonmedically
6.3.2 Adjusted Odds Ratios of Heavy Illicit Drug Use
6.3.3 Adjusted Odds Ratios of Substance Dependence and/or Abuse
6.4 Substance Dependence and/or Abuse Among Past Year Marijuana Users
6.4.1 Estimated Prevalence of Illicit Drug Dependence and/or Abuse, by Age of Marijuana Initiation
6.4.2 Adjusted Odds Ratios of Substance Dependence and/or Abuse

7. Discussion

References

Appendix

Appendix A: Statistical Methods and Limitations of the Data
Appendix B: Selected Standard Error Tables
Appendix C: Selected Questionnaire Pages (1999 and 2000 NHSDAs)

This page was last updated on June 16, 2008.