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At the other lab, Dr. David Ho, a professor of microbiology and immunology at Columbia University, and his team used blood plasma from 61 adults.

“Compared to non-users, marijuana users had 27% higher levels of iron in their blood, and 21% higher levels in their urine,” said lead author Tiffany Sanchez of the Mailman School of Public Health.

Editor's Note: The Columbia University research referenced here was led by Seth Prins, an assistant professor of epidemiology and sociomedical sciences at the Mailman School of Public Health.