Officials List Pot Vape Brands Reported in US Outbreak Chicago News WTTW E cigarettes don't need nicotine to be toxic 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 Disposable vapes release more toxic elements than tobacco smoke These could be the worst vape flavours for your health, according to science BBC Science Focus Magazine