Ohio Woman Has 'Black and Bloody' Vape Juice Removed from Lungs Fears vaping could cause Cancer Healthwatch Barnsley 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 Fruity flavors lure teens into vaping longer and taking more puffs, study says Los Angeles Times Does Vape Juice Expire?