Blood and Urinary Metal Levels among Exclusive Marijuana Users in NHANES (2005-2018).

Background: Marijuana is the third most used drug in the world.

Objectives: Because the cannabis plant is a known scavenger of metals, we hypothesized that individuals who use marijuana will have higher metal biomarker levels compared with those who do not use.

Methods: We combined data from the National Health and Nutrition Examination Survey (2005-2018) for participants, classified by use: non-marijuana/non-tobacco, exclusive marijuana, exclusive tobacco, and dual marijuana and tobacco use.