Legal age for marijuana should be 25 because it hurts teenage brains, suggest experts

With research showing harmful effects of marijuana on developing adolescent brains, Ottawa should tread carefully in how it legalizes the drug, including consideration of a high minimum age for usage, a panel on substance abuse said Friday.

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Two members of a panel speaking in Calgary said updated research about the ways regular marijuana use negatively affects adolescents in numerous ways should colour the debate over the cannabis legalization promised by the new Liberal government.

Knowledge that cannabis affects the developing brain until age 25 should influence any legalization age restrictions, said Dr. Philip Tibbo, director of the Nova Scotia Early Psychosis program.

“With a drinking age at, say, 18, does that mean we have to have the same age for cannabis as well?” said Tibbo.

The increasing content of cannabis’s active ingredient, THC, complicates regulating the drug, said Dr. Franco Vaccarino, a chairman of the Canadian Centre on Substance Abuse, which hosted Friday’s discussion.

“What percentage of THC are we talking about?” said Vaccarino.

“Given the increasing amount of knowledge, we owe it to ourselves to elevate the conversations — there’s not one simple thing we’re talking about in legalization.”

Vaccarino said a trend in the 1980s to view drug risks seriously led to lower use of certain substances and a dark public perception of their use. That has since been reversed, he added.

“In this world of unprecedented access to information, it’s ironic that there’s so much misinformaton,” said Vaccarino, who noted that, despite Canada’s marijuana prohibition, the country has one of the highest rates of use among developed countries.

The panel said the latest research debunks numerous myths of cannabis’s harmlessness while highlighting the damage it causes to adolescent brains during their formative years.

Some of those impacts can be seen in academic results, said Tibbo.

“You can measure that in test scores and even the ability to finish high school and move to post-secondary education,” he said. “There are definite patterns in changes in brain structure…it’s the long-term effects we’re more concerned about.”

Marijuana use among Canadians aged 15-24 ranges from 22 per cent to 26 per cent with the highest rates among those in the older age brackets, states the abuse centre.

In past-year use, 40 per cent of young people admitted misusing alcohol, while the number for cannabis was 19 per cent and four per cent for pharmaceuticals.

Social acceptance of marijuana use, particularly among the young, has reached troubling proportions driven largely by the discussion surrounding it, said Dr. Kim Corace of the Royal Ottawa Mental Health Centre.

“In my discussions with them, they believe marijuana use is already legal,” she said.

Cannabis use is also known to contribute to mental-health disorders in young people, particularly those already pre-disposed to them, said Corace.

“Those who do use cannabis are at greater risk of developing depression, and earlier,” she said.

Four American states have legalized marijuana with several others leaning in that direction.

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SOURCES: http://www.calgaryherald.com, BILL KAUFMANN

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