Marijuana Use May Impair Memory and Learning: New Study

Marijuana use can impair cognitive function — especially for youth — according to a new study published in the journal Addiction.

CNN interviewed one of the study’s authors, writing,

“Our study enabled us to highlight several areas of cognition impaired by cannabis use, including problems concentrating and difficulties remembering and learning, which may have considerable impact on users’ daily lives,” said coauthor Dr. Alexandre Dumais, associate clinical professor of psychiatry at the University of Montreal.

“Cannabis use in youth may consequently lead to reduced educational attainment, and, in adults, to poor work performance and dangerous driving. These consequences may be worse in regular and heavy users,” Dumais said.

This latest research underscores the toll that marijuana use can take on the brain — especially for teenagers and young adults.

Researchers have found time and again that marijuana is dangerous.

Last spring a study out of California found infants were 35% more likely to die within a year of birth if their mother used marijuana heavily; the study also found that infants were more likely to be born preterm, have a low birth weight, and be small for their gestational age.

Researchers have linked marijuana use with psychosisschizophreniadepression and suicide.

A study published in the Canadian Medical Association Journal last year found adults under age 45 who frequently used marijuana were roughly twice as likely to suffer heart attack as adults who did not use marijuana.

A report published in the Journal of the American Medical Association found that states that legalized commercial marijuana sales saw self-harm rates rise by 46% among men ages 21 to 39.

All of this comes as groups work to legalize recreational marijuana in Arkansas and pro-marijuana political action committees work to elect candidates who support marijuana.

As we have said time and again, marijuana may be many things, but “harmless” simply is not one of them.

Legalizing Marijuana Linked to Increase in Driving While High, Traffic Deaths

A study published this month in The New England Journal of Medicine shows Canada saw a dramatic increase in driving while high following legalization of marijuana in 2018.

The study examined 4,339 drivers treated after car accidents in British Columbia.

Researchers studied levels of THC — the active ingredient in marijuana — found in the blood of injured drivers.

The study’s authors concluded that, “the prevalence of moderately injured drivers with a THC level of at least 2 ng [nanograms] per milliliter in participating British Columbia trauma centers more than doubled” after Canada legalized marijuana in 2018.

Researchers noted that the increase in driving while high was largest among older drivers and male drivers.

These findings track with other research about the dangers of driving under the influence of marijuana following legalization.

In 2020 a AAA Foundation study found that the estimated number of drivers involved in fatal crashes in Washington State doubled after legalization of marijuana.

Another AAA Foundation study published last year found that, “People who use both alcohol and marijuana are some of the most dangerous drivers on the road,” and that “drivers who use both marijuana and alcohol were significantly more prone to driving under the influence of alcohol versus those who only drink alcohol but do not use marijuana.”

In September of 2020 the Rocky Mountain High Intensity Drug Trafficking Area released a report that found:

* Since recreational marijuana was legalized in 2013, traffic deaths in which drivers tested positive for marijuana increased 135% while all Colorado traffic deaths increased 24%.

* Since recreational marijuana was legalized, traffic deaths involving drivers who tested positive for marijuana more than doubled from 55 in 2013 to 129 people killed in 2019. This equates to one person killed every 3 1/2 days in 2019 compared to one person killed every 6 1/2 days in 2013.

* Since recreational marijuana was legalized, the percentage of all Colorado traffic deaths that were marijuana related increased from 15% in 2013 to 25% in 2019.

States that are thinking about legalizing recreational marijuana need to take a serious look at the unintended consequences other states have suffered — such as increased car accidents and traffic fatalities

All of this underscores what we have said for years: Marijuana may be many things, but “harmless” simply is not one of them.