Last updated on: 5/13/2008 | Author: ProCon.org

John L. Horwood, PhD Biography

Title:
Research Associate Professor at the Christchurch School of Medicine & Health Sciences at the University of Otago
Position:
Not Clearly Pro or Con to the question "Should Marijuana Be a Medical Option?"
Reasoning:

“Regression models adjusting for observed and non-observed confounding suggested that daily users of cannabis had rates of psychotic symptoms that were between 1.6 and 1.8 times higher (P<0.001) than non-users of cannabis….

The results of the present study add to a growing body of evidence suggesting that regular cannabis use may increase risks of psychosis.

The present study suggests that:
A. the association between cannabis use and psychotic symptoms is unlikely to be due to confounding factors; and
B. the direction of causality is from cannabis use to psychotic symptoms.”

“Tests of Causal Likages Between Cannabis Use and Psychotic Symptoms,” Addiction, 2005

Involvement and Affiliations:
  • Research Associate Professor, Christchurch School of Medicine & Health Sciences, University of Otago, New Zealand
  • Director and Biostatistician, Christchurch Health and Development Study Research Unit
  • Former Senior Research Fellow of the Christchurch Health and Development Study
  • Gold medal award for excellence in research at the School of Medicine & Health Sciences, University of Otago
Education:
  • PhD, School unknown
Other:
  • None found