Class A - super mini
     The appearance of such structures is similar to ordinary cigarettes. The miniature closed case consists of the following parts:

• cartridge up to 0.3 ml;
• battery capacity less than 85 mAh.

     The length of the structure does not exceed 105 mm. There are no replaceable parts in the gadget. This is an inexpensive device with a modest supply of liquid and battery. The device is perfect for those who want to quit smoking, but are not going to switch to vaping.
Class B - mini
     Such models also resemble classic cigarettes. Their length is no more than 125 mm, the battery capacity is 200 mAh. The capacity of the cartridge is up to 0.5 ml. All components are hidden in the case. The evaporator is activated by pressing a button or by active air supply. This device is more expensive, but produces more steam. It is ideal for those who smoke no more than 10 cigarettes a day.
Class C - penstyle
     In appearance, the design is similar to a ballpoint pen. In such devices, you can replace the cartridge or add liquid. Most models are equipped with the ability to charge. The battery capacity is approximately 250 mAh and the tank capacity is at least 1 ml.
 
     Gadgets of this type are more expensive, but have good power. They are able to reveal all the flavor nuances of the slurry and create abundant clouds of vapor. Cigarette puff. In terms of resource, electronic cigarettes are compared with a pack of cigarettes. This is a great solution for those who are about to switch from smoking to vaping.
Class D - cigars
     The length of the products is the same as that of the previous type, but the diameter is larger. The devices are equipped with a battery capacity of up to 700 mAh and a tank of up to 1.2 ml. The design is characterized by excellent autonomy. The taste is multifaceted, and the vapor clouds become thicker and more voluminous.
Class E - fashion
     Models are presented in the largest assortment. They are suitable for daily use. Such gadgets are divided into box mods and mechanical mods. Both options demonstrate high power, are equipped with capacious tanks and capacious power supplies. Puff is cigarette and hookah. Most models are adjustable with a hole ring. Evaporators in such structures give out record clouds of steam. They make it easy to quit smoking, no matter how many cigarettes a person smokes a day. Vaping with this vape is a pleasure, because it contributes to the maximum disclosure of the taste of the liquid. Accordingly, such devices are more expensive.mechmods
     The design consists of an atomizer and a battery. The evaporator is turned on with one button. Requires skillful handling, therefore not recommended for use by beginners. Advantages - low price and the possibility of using winding with low resistance indicators.
 
     The battery is being discharged unevenly. As the charge decreases, the vapor clouds lose volume.
Boxmods
     The device is a block in which batteries and digital content are located. Comes with an atomizer. The main advantage of the device is that vapers can change the parameters of its operation depending on their preferences. Several buttons and various settings modes are used for control.
Main advantages:

• flexible settings;
• safety of use: devices are equipped with protection against overcharging, short circuits, etc.;
• thanks to the use of a linear regulator, the current is supplied in the original characteristics regardless of the battery charge level.

     Most models have Bypass mode, which allows you to use low-resistance windings. The gadget works like a mechanical mod, but in safe mode.
Class F - electronic tubes
     These are rare devices whose functionality is on par with electronic cigars. They are equipped with batteries up to 1000 mAh. The shape and size resembles a smoking pipe.
The choice of the type of electronic cigarette depends on the technical parameters, purchasing power and user experience.