Juul Labs Announces Action Plan to Curb Underage Use of E Vapor Products Convenience Store News Differences in flavourant levels and synthetic coolant use between USA, EU and Canadian Juul products Tobacco Control JUUL electronic cigarette products linked to cellular damage. The nicotine concentrations are sufficiently high to be cytotoxic, or toxic to living cells, when tested in vitro with cultured respiratory system cells : JUUL Pod Ingredients: What's in E Cigarettes?