Mixing your own e-liquid starts with a ready-made base, which makes up about 80-90% of your mix. This is essentially a "neutral" (flavorless) liquid with or without nicotine, to which one or several flavor additives are added. To create e-liquid, two main components are used: propylene glycol (PG) and vegetable-derived glycerin (VG).

Using only 1 component at 100%:

• 100% Propylene Glycol: This base is the best flavor carrier. When combined with nicotine, it provides a strong throat hit. However, if the throat hit sensation is too strong, the amount of vapor generated is minimal. Its use can cause problems with certain atomizers and lead to strong leakage due to good fluidity. Note that PG causes dehydration, so using 100% PG implies consuming a large amount of liquid to quench thirst.
  
  
• 100% Vegetable Glycerin: This base produces a lot of vapor and imitates traditional cigarette smoke well. The density of the generated vapor is dense and thick, which usually stays in the air longer. However, this slightly affects the taste (sweetness), and the throat hit is limited. Since glycerin is thick enough, it fills the heating element very slowly, which means it needs to be replaced earlier. It should also be noted that pure glycerin heated to a temperature above 150°C produces acrolein, a substance that is present in the smoke of a real cigarette and is known as a toxic and potentially carcinogenic substance.

You can also create your own blends of two components and get the benefits of both propylene glycol and vegetable glycerin, depending on your own needs.

Mixed base:

• 50VG/50PG - a mixture consisting of 50% propylene glycol and 50% vegetable glycerin. This base is typically used to achieve a moderate amount of vapor production, as well as better flavor and throat hit transmission when used in electronic cigarettes. It has a lower viscosity, so it moves more easily through the heating element and does not cause difficulties when used with different types of atomizers.
  
  
• 70VG/30PG - a mixture consisting of 70% vegetable glycerin and 30% propylene glycol. This base is typically used to achieve a denser vapor production and a sweeter taste. It also provides a smoother throat hit as it contains less propylene glycol. However, this base is thicker, which may lead to slower filling of the heating element and subsequent replacement.

In the end, the choice between them depends on the user's personal preferences, the type of device used for vaping, and other factors such as desired taste and amount of vapor.