Understanding the association between adolescent marijuana use and later serious drug use: Gateway effect or developmental trajectory?

@article{Cleveland2008UnderstandingTA,
  title={Understanding the association between adolescent marijuana use and later serious drug use: Gateway effect or developmental trajectory?},
  author={H. Harrington Cleveland and Richard P. Wiebe},
  journal={Development and Psychopathology},
  year={2008},
  volume={20},
  pages={615 - 632}
}
Abstract Because marijuana use often precedes the use of other psychoactive substances, it has been characterized as a gateway to these other substances. The present study used data from both monozygotic (MZ) and dizygotic (DZ) twin pairs drawn from the National Longitudinal Study of Adolescent Youth (Add Health) to examine the “gateway effect” role of earlier marijuana on later hard drug use. Difference score analyses reveal that within-pair differences in earlier marijuana use, controlling… 
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