Researchers from Columbia University found marijuana users had 27% higher blood lead levels compared to those who refrained from marijuana or tobacco.
Analyzing data from a group of more than 7,200 adults, researchers from Columbia University Mailman School of Public Health found that the 358 people who reported using marijuana within the past 30 days had 27% higher blood lead levels, compared to those who said they refrained from both marijuana and tobacco.
The researchers studied data from blood and urine samples collected between 2008 and 2015 as part of the National Health and Nutrition Examination Survey, which is conducted by the National Center for Health Statistics
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