Thousands of unauthorized vapes are pouring into the US despite the FDA crackdown on fruity flavors AP News 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 Vaping: It's Deadly NFCR Juul nicotine hit may be 'worst for kids, best for smokers' WHYY