Many people turn to marijuana or cannabidiol to ease their achy joints and help them, but a new study suggests that could wreak havoc with any other medications they're taking.

Why? Because the body uses the same set of enzymes to process them all, scientists report. The chemicals in marijuana -- THC, cannabidiol, or CBD, and cannabinol, or CBN -- are metabolized in the body by at least two families of enzymes that also help process and eliminate more than 70% of the most commonly used prescription drugs from the body, the researchers said.