Marijuana effects: Debunking political rhetoric

On Saturday October 3, 2015 Canadian Prime Minister Stephen Harper stated to a cheering partisan audience: “Tobacco is a product that does a lot of damage. Marijuana is infinitely worse and it’s something that we do not want to encourage.”

He added, “There’s just overwhelming and growing scientific and medical evidence about the bad long-term effects of marijuana,” not providing examples or citations.

The British peer-reviewed journal Lancet published a study titled “Drug Harms in the UK: A Multicriteria Decision Analysis” on Nov. 1, 2010 which calculated the harm factors of 20 drugs from alcohol to marijuana to tobacco based on harm. The study calculated harm caused to individuals as for example dependence, mortality, and impairment of mental functioning which were lumped under “harm to users,” as well as “harm to others” as for example crime, environmental damage, and international damage. What makes this experimental approach useful is...

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