The word “smoking” has nothing to do with vaping since a person does not inhale products of combustion but steam, as during inhalation.

In fact, you can literally explain the principle of an electronic cigarette device on your fingers: there is a battery, a heating element (evaporator), and liquid. The evaporator is a simple thing: it is usually a spiral made of metal, inside of which a piece of fleece or cotton is inserted. The material absorbs liquid, it heats up and begins to evaporate it - it is this vapor that the vaper then inhales.
Electronic cigarette liquid usually consists of three components: food glycerin, propylene glycol, and food flavorings. Often there is nicotine in them (its concentration can be chosen at your discretion), but many use non-nicotine fluids. The first is responsible for the vapor - the higher its concentration in the liquid, the thicker, richer, and denser it is. Polypropylene glycol (PG) is an excellent solvent; it is responsible for the taste transfer and mixing of the flavor with other components; therefore, the more PG, the less vapor there is, but it tastes better. In addition, PG hits the throat, a sensation that smokers of heavy cigarettes love so much.
The proportions of these ingredients in the liquid can be varied based on your preferences. There are many flavorings to choose from. Their number is in the hundreds: from all possible fruits and their derivatives (peach, cherry, or strawberry and cream) to tobacco flavors (fragrant Virginia tobacco from sunny plantations of the southern USA) and very extreme options. If desired, you can find on the Internet liquids with the taste of pizza, cucumber, and even eggs.
So, let’s say you’ve met a good woman for marriage. What about a journey that awaits her in the future? 
The vaping journey for many begins with attempts to quit smoking, usually unsuccessful ones. A typical situation: a person comes to the store, sees an electronic cigarette at the checkout that is worth just a couple of bucks, and decides to try it. Such devices give little, and their taste at best resembles fruit chewing gum, but for many, this is enough to become interested. And then a person either returns to ordinary cigarettes or rushes into the depths of the Internet to study the topic.
And there, completely unexpectedly, a whole world opens up for a newborn vaper: specialized forums, vaping shops, copyright workshops, tips, and video guides on YouTube.
So the next step is to buy a proper device with a rechargeable battery, the ability to fill the fluid in the tank, and even change the evaporators. But this is not where it ends for a beginner, they will crave more vapor, and soon, their once perfect device now seems outdated. And yeah, we all think of those videos where they cover the whole room with vapor after just one inhalation.
So vaping becomes a hobby: you learn more and more devices, remember many things about how they work, the power of the battery pack, get into technical details, and even start winding spirals from a Chinese wire purchased on the Internet, buying Japanese cotton and mixing liquids.
The market is developing very quickly, new devices come out almost every month, and some people switch their devices every couple of months, as I recently did with my drip tip (an electronic cigarette type that reveals the taste of liquid to the maximum but requires manual filling after a couple of puffs). Some may require a new tank. Or a two-hundred-watt battery pack.
The leaders of the vaping industry are Chinese. It is Chinese devices that are the most common, successful, and, simply, the best. The cost of a good starter kit, which includes everything you need for a tasty "hover," except for the battery, which is not a problem to buy, starts at around $75-100. You can get by with a cheaper device, but they usually have a number of disadvantages like not the highest power, leaking evaporators, and non-replaceable low-capacity batteries. It’s better not to save money and immediately buy a good device for the year ahead.