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Study Links Cannabis Use to Bigger, Sharper Brains in Seniors

2/5/2026

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Summary

Story summary

A study of 26,362 participants aged 40 to 77 found that greater lifetime cannabis use links to larger brain volumes and improved cognitive function in older adults.
The study focused on brain regions with high cannabinoid receptor density, such as the hippocampus, which is crucial for memory.
Increased cannabis use was linked to lower brain volume in the posterior cingulate, signaling nuanced effects and the need for further investigation.

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Story summary

A study of 26,362 participants aged 40 to 77 found that greater lifetime cannabis use links to larger brain volumes and improved cognitive function in older adults.
The study focused on brain regions with high cannabinoid receptor density, such as the hippocampus, which is crucial for memory.
Increased cannabis use was linked to lower brain volume in the posterior cingulate, signaling nuanced effects and the need for further investigation.