Heavy Metal Contamination Found in Marijuana Users' Blood and Urine

A study conducted at Columbia University's Mailman School of Public Health has found that marijuana users have elevated levels of heavy metals, specifically lead and cadmium, in their blood and urine compared to non-marijuana users. The study used data from over 7,200 participants and concluded that marijuana is a source of cadmium and lead exposure. The World Health Organization warns that lead can cause permanent intellectual disabilities and behavioral disorders, while cadmium is considered a human carcinogen with toxic effects on the kidneys, skeletal, and respiratory systems. The researchers emphasize the need for further research on cannabis use and contaminants to address public health concerns.