Reassessing the marijuana gateway effect.

@article{Morral2002ReassessingTM,
  title={Reassessing the marijuana gateway effect.},
  author={Andrew R. Morral and Daniel F. McCaffrey and Susan M. Paddock},
  journal={Addiction},
  year={2002},
  volume={97 12},
  pages={
          1493-504
        }
}
AIMS Strong associations between marijuana use and initiation of hard drugs are cited in support of the claim that marijuana use per se increases youths' risk of initiating hard drugs (the 'marijuana gateway' effect). This report examines whether these associations could instead be explained as the result of a common factor-drug use propensity-influencing the probability of both marijuana and other drug use. DESIGN A model of adolescent drug use initiation in the United States is constructed… 
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