Oregon Second District Congressman Greg Walden highlighted counterfeit THC cartridges during a House Energy and Commerce Oversight and Investigations Subcommittee hearing on e-cigarettes on Thursday.  Walden said with an unidentified lung illness that appears to be related to vaping and has killed seven people and sickened over 500 across at least 38 states, the government is right to look for solutions to curtail youth access to e-cigarettes.  But he said they need to include a full investigation into counterfeit THC cartridges along with the vaping and cannabis black markets.  Walden noted a third-part lab test of counterfeit THC cartridges requested by the California Department of Public Health found as common contaminants pesticides and a fungicide that when vaporized converted into a chemical used as a weapon during World War I.