National Post (National Edition)
Legalizing weed will harm youth, warns CMA editorial
Author cites ‘toxic’ effect on developing brain
The interim editor-in-chief of the Canadian Medical Association Journal is pleading for the defeat of a federal government plan to legalize marijuana, fearful youth will have easier access to a drug that damages their developing brains.
“Simply put, cannabis should not be used by young people,” Dr. Diane Kelsall writes in an editorial published Monday in the journal. “It is toxic to their cortical neuronal networks, with both functional and structural changes seen in the brains of youth who use cannabis regularly.”
Bill C-45, if passed, would make marijuana use legal for adults aged 18 and over. Yet current research shows the brain doesn’t reach maturity until around age 25, Kelsall notes in the editorial.
A Canadian Paediatric Society position paper on the effects of cannabis on children and youth cites such serious potential effects as: increased presence of mental illness, including depression, anxiety and psychosis; diminished school performance and lifetime achievement; increased risk of tobacco smoking; impaired neurological development and cognitive decline; and a risk of addiction.
The nine-per-cent risk of developing dependence over who’s ended up basically on the fringes of society,” said Kelsall, who has dealt with these teens in her family practice and personally.
“That is why I wrote this editorial. My worry is this legislation will increase the likelihood that kids who are vulnerable will have easier access to marijuana.”
Bill C-45 and associated changes to the Criminal Code would make it possible time they reached 15.
But Kelsall said that while the government says the bill tackles the legalization from a public health perspective, it doesn’t.
The bill allows people to grow up to four plants for personal use, as long as they’re no more than onemetre tall.
“If it’s a public-health approach, why would you have that available in people’s homes,” she asked. “What is going to happen over time is you’re going to have people with four very, very (potent) plants and there’s no way that you would know that youth aren’t accessing those plants.”
She said studies looking at MRIs show definite changes in the brains of people who smoke marijuana. The link to mental-health problems is particularly concerning, she writes, noting that while there’s no causal link, “there is a higher risk of having these mental-health disorders” among young people who smoke marijuana.
The Canadian Medical Association has recommended the government raise the legal age for buying marijuana to 21, and restrict the quantity and potency of the marijuana available to those under 25. Kelsall called those “pragmatic recommendations” that balance the need to protect the developing brains of young people with the reality that young people who can’t buy it legally will buy it from illegal sources.