The nicotine levels in an e-juice flavors are a crucial feature as it allows users to higher or lower their dose of nicotine for their satisfaction. But, there are a few people who want to work with a nicotine-free liquid as a way to satisfy their smoking habit. It is essential to say that e-liquid producers do not have a dose level that is regular. However, there are some general guidelines that they follow when preparing their products. Locating the best e-liquid will be determined by balancing out the nicotine levels to the amount that is right.