A Columbia University study found high metal levels in marijuana users' blood and urine, highlighting potential health risks and emphasizing the need for consistent regulations. Research recently conducted at Columbia University Mailman School of Public Health detected significant levels of metal
A recent study discovered significant levels of metals in the blood and urine of marijuana users, indicating marijuana as a possible unrecognized source of lead and cadmium exposure. This research, among the first to link self-reported marijuana use with internal metal exposure, raises concerns about public health, especially as marijuana consumption rises and federal regulations remain inconsistent.
This is among the first studies to report biomarker metal levels among marijuana users and most likely the largest study to date, that links self-reported marijuana use to internal measures of metal exposure, rather than just looking at metal levels in the cannabis plant. The results were published on August 30 in the journalMeasurements reported by participants for exclusive marijuana use compared to nonmarijuana-tobacco had significantly higher lead levels in blood and urine .
McGraw and colleagues classified the 7,254 survey participants by use: non-marijuana/non-tobacco, exclusive marijuana, exclusive tobacco, and dual marijuana and tobacco use. Five metals were measured in the blood and 16 in urine. While 28 states regulate inorganic arsenic, cadmium, lead, and total mercury concentrations in marijuana products, regulation limits vary by metal and by state.
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