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Is cannabis a gateway to hard drugs?

Is cannabis a gateway to hard drugs?,10.1007/s00181-009-0280-z,Empirical Economics,Hans Olav Melberg,Andrew M. Jones,Anne Line Bretteville-Jensen

Is cannabis a gateway to hard drugs?   (Citations: 4)
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The gateway hypothesis proposes that use of cannabis directly increases the risk of consuming hard drugs. We test this controversial, but influential, hypothesis on a sample of cannabis users, exploiting a unique set of drug price data. A flexible approach is developed to identify the causal gateway effect using a bivariate survival model with shared frailty estimated using a latent class approach. The model suggests two distinct groups; a smaller group of “troubled youths” for whom there is a statistically significant gateway effect that more than doubles the hazard of starting to use hard drugs and a larger fraction of youths for whom previous cannabis use has less impact.
Journal: Empirical Economics - EMPIR ECON , vol. 38, no. 3, pp. 583-603, 2010
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