Cool new study reported by Reuters.
As marijuana becomes more accessible to young and old alike in the U.S., researchers warn that long-term use of the drug may cause lasting harm to at least one type of brain function.
A new study based on following thousands of young adults into middle age finds that long-term marijuana use is linked to poorer performance on verbal memory tests, but other areas of brain function do not appear to be affected.
“We did not expect to find such a consistent association with verbal memory for chronic exposure to marijuana,” especially since the link held even when other factors like cigarette smoking, alcohol use and other behavioral factors associated with marijuana use were accounted for, said lead author Dr. Reto Auer of the University of Lausanne, Switzerland.
Auer and colleagues analyzed data from a 25-year U.S. study of young adults, which included repeated measures of marijuana exposure over time and a standardized test of verbal memory, processing speed and executive function in year 25. Almost 3,500 participants completed the standardized tests.
At the beginning of the study period in the 1980s, participants were 18 to 30 years old and more than 80 percent reported past marijuana use. Just 12 percent continued to use marijuana into middle age, according to the results in JAMA Internal Medicine.
Researchers found that as past years of marijuana use increased, verbal memory scores decreased. In practical terms, the results meant that for every additional five years of exposure, 50 percent of marijuana users would remember one less word from a list of 15 tested words.
“Recreational marijuana users use it to get high, to benefit from the transient change it produces,” Auer told Reuters Health by email. “But this transient effect might have long term consequences on the way the brain processes information and could also have direct toxic effects on neurons.”
What I am finding out as I age is that I have to keep pushing back the date of my “retirement”. I thought I could quit working at 30, then 35, then 40. Now I am thinking 45 before I can be more free. The point is that the world is becoming a more difficult place to be independent. A lot of government spending is going on, and a lot of debt is being added to our national debt. I may never be able to stop working. And it’s a good thing that I will have all my faculties intact when I have to keep working. Be careful with exchanging short-term fun and thrills for long-term poverty. Things are not getting easier, you’ll have to work just to get by.
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