Concern is growing about synthetic cannabinoids found in THC vapes stronger, riskier, and unpredictable. These substances sometimes called fake weed have been linked to seizures, paranoia and even Do Cannabis Vapes Contain More Chemicals Than Users Expect? Toxic metal particles can be present in cannabis vapes even before the first use American Chemical Society Some vapes claiming to be cannabis contain 'synthetic cannabinoid' study UK news The Guardian Young Adults Mix Cannabis with Nicotine, Tobacco RT Committee Blog: Regulations in the Inhalable Cannabis Space A Call for Sensible Flavor Regulation for Cannabis Vapes