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UK: Study Finds No Casual Link Between Marijuana Use And Depression

NORML News

Thursday 28 Sep 2006

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Baltimore, MD: Marijuana use by adults is not a statistically
significant predictor of depression, according to the results of an
ongoing longitudinal study to be published in the October issue of the
journal Addiction.

Investigators at John Hopkins University in Baltimore and at the
Bloomberg School of Public Health in Santa Monica assessed the
association between self-reported marijuana use and current depression
in 8,759 adults (age range 29-37 years) over a 17-year period.
Investigators concluded, "After adjusting carefully for baseline
differences between adults who subsequently use marijuana and those who
abstain, the significant associations that are initially present between
ongoing marijuana use and depression are substantially reduced, if not
eliminated."

They added, "The findings reported in this paper suggest that the
associations observed between marijuana use and subsequent depression
status may be attributable not to continued marijuana use, per se, but
to third (common) factors associated with both the decision to use
marijuana and to depression."

A separate study co-authored by NORML Advisory Board Member Dr. Mitch
Earleywine and published last year in the journal Addictive Behaviors
determined that adults who use cannabis report suffering from less
severe incidents and/or symptoms of depression than non-users.

"Despite comparable ranges of scores on all depression subscales, those
[respondents] who used cannabis once per week or less had less depressed
mood, more positive affect, and fewer somatic (physical) complaints than
non-users," authors wrote. "These data suggest that adults apparently do
not increase their risk for depression by using marijuana."

Commenting on the most recent study, Earleywine said, "This new data is
actually markedly stronger than my earlier work because the
investigators utilized a large, representative sample and conducted
long-term follow up research. If marijuana use caused depression, this
design model would have revealed it by showing the development of
symptoms in users. There's simply no support for the idea."

For more information, please contact Paul Armentano, NORML Senior Policy
Analyst, at (202) 483-5500. Full text of the study, "Marijuana use and
depression among adults: testing for causal association," appears in the
October issue of Addiction. To listen to an interview with Dr. Mitch
Earleywine about the study, please download the September 27, 2006
edition of the NORML Audiostash.
http://www.norml.org/index.cfm?Group_ID=7059

 

 

 

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