An electronic cigarette (e-cig or e-cigarette), is a battery-powered vaporizer that feels similar to tobacco smoking. The user inhales an aerosol, commonly called vapor, rather than cigarette smoke. E-cigarettes typically have a heating element that atomizes a liquid solution known as e-liquid. E-cigarettes are generally cylindrical, with many variations. There are disposable or reusable versions. E-liquids usually contain propylene glycol, glycerin, nicotine, and flavorings. E-liquids are also sold without propylene glycol, without nicotine, or without flavors.
As of 2013, there are several million e-cigarette users globally. Awareness and use of e-cigarettes greatly increased over the few years to 2014, particularly among young people and women in some countries. E-cigarette use among young people exceeds traditional cigarette use. People with higher incomes are more likely to have heard of e-cigarettes, but those with lower incomes are more likely to have tried them. Trying e-cigarettes was common among less educated people. Most users have a history of smoking normal cigarettes. Some young people who have never smoked normal cigarettes have tried e-cigarettes at least once.
There are a growing number of electronic cigarettes (e-cigs) with temperature control functionality, allowing a fool-proof way to avoid either the overheating of Propylene Glycol (PG) and Glycerine (VG), the common carrier liquids for nicotine and flavoring, or a "dry puff", where the wick becomes too dry to produce vapor, and simply burns instead.
Let’s see the internal structure of the electronic cigarette, there is a glass encapsulated NTC thermistor components which located in the place close to the heating elements side, it is through this NTC thermistor components to detect and control the temperature of the electronic cigarette during use.So that users can use the electronic cigarette more safely.