What happens when you get stoned every single day for five years

New research published today in the journal JAMA Internal Medicine confirms what many of us have suspected for some time: If you smoke a lot of weed — like a lot of it — it can potentially do permanent damage to your short-term memory.

Professor Reto Auer of the University of Lausanne led a team of researchers who examined data on the marijuana habits of nearly 3,400 Americans over a 25-year period. At the end of the study period, the subjects took a battery of tests designed to assess cognitive abilities — memory, focus, ability to make quick decisions, etc.

The study found that people who smoked marijuana on a daily basis for a long period of time — five years or more — had poorer verbal memory in middle age than people who didn't smoke, or who smoked less. This association remained even after researchers controlled for a variety of other factors known to...

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