What weed really does to your brain, according to hundreds of thousands of scans

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  • Source: NY Post
  • 04/21/2026

Not to ruin your high, but habitually smoking marijuana has been known to take a toll on the body.

It can irritate the lungs, damage blood vessels and accelerate heart rate. Not to mention the scromiting, the screaming — and vomiting! — that can accompany long-term, heavy use.

The brain also takes some hits.

“From a brain imaging perspective, marijuana use is consistently associated with measurable changes in brain function,” Dr. Daniel Amen, founder of Amen Clinics, which has conducted hundreds of thousands of scans to measure blood flow and activity in patient brains, told The Post.

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