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We discussed the main ingredients and their functions and efficacy in previous articles.Today we talk about how the ingredients can be used to predict an e-liquid’s flavor.

 One of the most important reasons for e cigarettes’ great popularity is the assortment of available e-liquid flavors,the flavors increase product attractiveness among all types of users . Although,the multi-flavor e cig will attract some smokers shift from tobacco smoking,while it may facilitate smoking initiation among never-smokers.One way of regulating e-liquid flavors could be restriction of flavor categories that are particularly appealing to non-user of youth. This article is to identify the most commonly used e-liquid flavorings in general and determine potential flavoring that are specific to a single flavor category.

 According to a standardized approach, e liquid flavors are classified into one of the following 16 main flavor:

Tobacco; menthol/mint; nuts; spices; coffee/tee; alcohol; other beverage; fruit-berries; fruit- citrus; fruit -tropical; fruit -other; dessert; candy; other sweet; other flavors and unflavored.

Mean number of flavorings

The mean number of reported flavorings per e-liquid was 10±15, and the mean number of flavorings per flavor category(excluding unflavored) ranged from 3±8 (for nuts) to 18±20 (for dessert).

 Most frequently added flavorings and their quantities

219 unique ingredients are reported to be added more than 100 e-liquids of the entire data set. Ingredients other than flavoring ingredients were glycerol, nicotine, propylene glycol, water, ethanol and triacetin,these compounds were 94%, 88% ,86%, 45%, 23% and 15% of all e-liquids.

Supplemental material

Twenty-five flavoring ingredients were added to more than 10% of the overall e-liquid.the most frequently used supplemental material were vanillin( 35.2%), ethyl maltol (32%), and ethyl butyrate( 28.4%). the highest median concentration was reported for menthol( 18.4 mg/ 10 ml) and the lowest median concentration as reported for benzaldehyde (0.3 mg /10 ml).

 All above are for the reference of regulation on vape(e cig),however, the practitioners of e liquid concerns more about which flavors are prevailing, and when new flavors will emerge. And there all kinds regulations on the liquid–such as the strength of nicotine,the nicotine is extracted from natural leafs or it is synthesized.