Recently, there's been some confusion on the amount of nicotine in e liquids. The problem comes from the difference between freebase nicotine and nicotine salts. Freebase nicotine is the purest form of nicotine. E Liquide Bonbon citron Sel de Nicotine Roykin Nicotine 10 mg Chapter 3: Getting e liquids right Make My Vape Vape Juice Nicotine Levels for Dummies What is BAR SALT E Liquid? A Guide To BAR SALTS Vaping360 High nicotine e cigarettes dominate the market, with sales increasing 15 fold in five years