For decades, critics of cannabis have warned that using marijuana would eventually “rot your brain.”
But new research suggests that may not be the case—at least when it comes to aging and dementia.
A recent study looking at older adults with a history of cannabis use found no link between lifetime marijuana consumption and increased risk of cognitive decline or dementia. Researchers compared older adults who had used cannabis at some point in their lives with those who hadn’t and found no significant differences in cognitive health later in life.
In fact, some findings went even further.
Data published in the Journal of Studies on Alcohol and Drugs showed that older adults with a history of cannabis use actually performed as well as—or sometimes better than—non-users on several cognitive tests, including attention, processing speed, and memory.
Other international research backs that up. Large studies of aging populations have also reported less cognitive decline among cannabis users compared to non-users, suggesting the relationship between cannabis and brain health might be more complicated than previously thought.
That doesn’t mean cannabis is automatically good for the brain. Scientists still say dose, frequency, and age of use matter, and heavy use—especially earlier in life—may carry different risks.
But the new findings challenge one of the oldest arguments in the anti-cannabis playbook.
After decades of warnings that marijuana would turn users into forgetful zombies, the growing body of research suggests something far less dramatic:
For many older adults, a lifetime of occasional cannabis use doesn’t appear to harm the brain at all.
Dabbin-Dad Newsroom
