Former Juul exec alleges company shipped tainted products These 2 vape flavors are the most toxic Futurity It causes more harm than other vape flavours Worst flavor I have ever had! : r Vaping Approximately 16,000 unique flavours have been identified for vapes, many of which appeal to potential users. Some flavours increase the toxicity of vape emissions and can generate compounds that are known to E cigarette flavors are toxic to white blood cells, warn scientists