Dr. Bachhuber and coauthors conclude: «To fully understand the effect of medical cannabis on the use of other drugs,
prospective longitudinal studies randomizing patients to cannabis versus other treatments are urgently needed.»
The search was limited by language (the paper had to be in English), by methodology (the
study had to be an empirical
study, experimental replication, follow - up
study,
longitudinal study,
prospective study, retrospective
study, quantitative
study, or treatment outcome /
randomized clinical trial), by publication type (the
study had to be a journal article published in a peer - reviewed journal), and by sample (the
study had to be conducted on humans).