Study suggests cannabis-users may be vulnerable to harder drugs.
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EllgrenM., SpanoS. M.& HurdY. L. . Neuropsychopharmacology, . - doi:10.1038/sj.npp.1301127 (2006).
Mount Sinai School of Medicine, New York
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Hopkin, M. Rats taking cannabis get taste for heroin. Nature (2006). https://doi.org/10.1038/news060703-9