Health · Medical Research · 4 hrs ago
Study links early cannabis legalization to rising heart-related hospitalizations
Researchers analyzed more than 50 million US hospital records from 2012 to 2018 to examine heart-related admissions.
They compared western states, where recreational cannabis sales began in 2014, with other parts of the country.
After sales began, rates of heart failure, heart attacks and irregular heartbeat rose faster in the West.
The study estimated that each year of legal sales was linked to increases of nearly 4% for heart failure, 3% for heart attacks and just over 2% for atrial fibrillation.
These figures show an association, not proof that legalization caused the increase.
The findings matter because they raise a possible public health concern as more states consider legal cannabis.
The researchers recommend caution and continued tracking of heart health outcomes.
A study found that heart-related hospital admission rates rose faster in western U.S. states after recreational cannabis sales began in 2014.
For each year of legal sales, rates rose by nearly 4% for heart failure, about 3% for heart attacks and just over 2% for atrial fibrillation.
Researchers analyzed more than 50 million hospital discharge records from 2012 to 2018.
The study found an association, but cannot establish that cannabis legalization caused the increase.
The researchers called for caution about legalization and continued collection of cardiovascular health data.
- Who
- Researchers led by Dr. Samuel Slavin of Boston University’s Chobanian & Avedisian School of Medicine.
- What
- A study linked recreational cannabis legalization in the western U.S. to faster increases in hospital admissions for several heart conditions.
- When
- The study analyzed records from 2012 to 2018 and was published in BMJ Open in October 2026.
- Where
- Western U.S. states, compared with other U.S. regions.
- Why
- Researchers examined whether early recreational cannabis legalization was associated with changes in cardiovascular hospitalizations.
This story does not have two clearly opposing sides.
Colorado voters passed a ballot initiative to legalize recreational cannabis.
Colorado became the first U.S. state to legalize recreational cannabis, and western states began selling it.
Researchers analyzed hospital discharge records and compared cardiovascular admission patterns across U.S. regions.
Massachusetts became the first eastern state to open legal cannabis dispensaries.
- Records analyzed
- More than 50 million hospital discharges
- Study period
- 2012–2018
- Heart failure
- Admission rates nearly 4% higher per year of legal sales
- Heart attacks
- Admission rates about 3% higher per year of legal sales
- Atrial fibrillation
- Admission rates just over 2% higher per year of legal sales
- Journal
- BMJ Open
2 sources
What people are saying
Our findings point to potential adverse effects of recreational legalization on population health