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“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.

The researchers referenced here are Yousin Suh, the Charles and Marie Robertson Professor of Reproductive Sciences, and Zev Williams, the Wendy D. Havens Associate Professor of Women's Health.