NBC News: Tests show bootleg marijuana vapes tainted with hydrogen cyanide

This comes as the CDC reports:

The latest findings from the investigation into lung injuries associated with e-cigarette use, or vaping, suggest THC products play a role in the outbreak. Most of the people (77%) in this outbreak reported using THC-containing products, or both THC-containing products and nicotine-containing products, according to a report published today in the CDC’s Morbidity and Mortality Weekly Report (MMWR).