Marijuana Law, Policy & Reform

Editor: Douglas A. Berman
Moritz College of Law

Tuesday, October 7, 2014

New article provides meta-review of latest health research concerning recreational marijuana use

This new monograph, which has just been published via the peer-reviewed journal Addiction, has a title that perfectly describes the piece's research and discussion, "What has research over the past two decades revealed about the adverse health effects of recreational cannabis use?".  Here are all the parts of the piece's abstract:

Aims:  To examine changes in the evidence on the adverse health effects of cannabis since 1993.

Methods:  A comparison of the evidence in 1993 with the evidence and interpretation of the same health outcomes in 2013.

Results:  Research in the past 20 years has shown that driving while cannabis-impaired approximately doubles car crash risk and that around one in 10 regular cannabis users develop dependence.  Regular cannabis use in adolescence approximately doubles the risks of early school-leaving and of cognitive impairment and psychoses in adulthood.  Regular cannabis use in adolescence is also associated strongly with the use of other illicit drugs.  These associations persist after controlling for plausible confounding variables in longitudinal studies.  This suggests that cannabis use is a contributory cause of these outcomes but some researchers still argue that these relationships are explained by shared causes or risk factors.  Cannabis smoking probably increases cardiovascular disease risk in middle-aged adults but its effects on respiratory function and respiratory cancer remain unclear, because most cannabis smokers have smoked or still smoke tobacco.

Conclusions:  The epidemiological literature in the past 20 years shows that cannabis use increases the risk of accidents and can produce dependence, and that there are consistent associations between regular cannabis use and poor psychosocial outcomes and mental health in adulthood.

Medical community perspectives, Medical Marijuana Data and Research | Permalink


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