Alcohol damaged teens’ brain tissue; marijuana did not (study)

From Alternet

Some new science demonstrates that marijuana may not have the harmful effects critics claim. In fact, while pot had no measured impact in a new study, the very legal and very lucratively-marketed substance alcohol actually has a worse health impact on young users.

Specifically, a new study of substance-using teenagers’ brains shows that the regular use of alcohol had a harmful effect on the boozing group, while the toking-up group’s brains suffered little alteration.

From Medical Daily, emphasis ours:

The researchers, from the University of California, San Diego and the University of Pittsburgh Medical Center, performed the study on 92 16- to 20-year-olds. The scientists scanned their brains both before and after an 18-month period. Over the course of the 18 months, half of the teens, who already had an extensive track record with alcohol and marijuana, continued their vices as they had before. The other half continued to abstain or drink a minimal amount, like they too had done before the study.

In addition to the brain scans, the study also required a detailed toxicology report and substance use assessment. The teens also were interviewed every six months. Researchers did not check the teens’ cognitive ability, but simply took brain scans.

The researchers found that, after the year and a half was over, kids who had drank five or more alcoholic beverages twice a week had lost white brain matter. That means that they could have impaired memory, attention, and decision-making into adulthood. The teens that smoked marijuana on a regular basis had no such reduction.

While other studies have had less clear results, this study is important for a few reasons.

First, it shows that early alcohol abuse can be dangerous because it damages the tissues that influence judgement and self-control. “If teens decrease their tissue health and cognitive ability to inhibit themselves, they might become more likely to engage in risky behavior like excessive substance use,” the Huffington Post quotes study co-author Joanna Jacobus, postdoctoral fellow at the University of California, San Diego, as saying.

The study authors also said that marijuana strains vary widely, so it’s harder to determine which if any ingredients in a typical joint have positive or negative effects.

The study will be published in the journal   Alcoholism: Clinical and Experimental Research.

~~~

From Smell the Truth

A study conducted by researchers at UC San Diego to be published in the April issue of the journal Alcoholism: Clinical & Experimental Research finds that teens who drink get brain damage, while teens who smoke do not.

A young woman lights a marijuana joint in May 2012. (via Alternet)

Researchers think this may be because alcohol’s active ingredient, ethanol, is a known neurotoxin, while cannabis has proven neuroprotective ingredients like cannabidiol.

UC San Diego researchers scanned the brains of 93 youngsters ages 16-20, before and after an 18-month period. Half the teens didn’t use pot or alcohol before, during or after the study, while the other half continued their normal habits. Teens consuming five or more drinks at least twice a week showed reduced white matter brain tissue, which can lead to declines in memory, attention and decision-making in adulthood. Teens who smoked pot did not show a change in brain tissue health, according to scans.

Alcohol has long-been known to cause nerve damage, in addition to cancer, stroke, and increase the risk of suicide. Conversely, ingredients in pot like CBD have been patented by the federal government as neuroprotectants during stroke, or to treat Alzheimer’s and Parkinson’s.

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