UWELL E Liquids: Flavors for Every Taste The Best Vape Flavours According to Vapers Vaping Products That Look Like Juice Boxes and Candy Are Target of Crackdown The New York Times Custom e Juice Labels, Vape Product Labels and More Tomorrow, further changes to vaping regulations come into effect. From March 21, e liquids will now be required to contain less than 28.5mg mL of nicotine salts. Currently, e liquids can contain up to 50mg mL.