Cannabis conundrum: Legal isn't always clean, nor illicit dirty Los Angeles Times Abbott veto pauses Texas' THC ban: What to know More than a dozen marijuana vaping products that had been OK'd for legal sale now testing positive for lead, cannabis regulators say masslive.com Is It Illegal in Pennsylvania to Use Vape Pens, Wax, or Oil Containing THC? The dirty, dangerous secret of California's legal weed Los Angeles Times Toxic metal particles can be present in cannabis vapes even before the first use American Chemical Society