Those liquids that are used in the cartridge are referred as e-liquid. E-liquids has three parts agents to produce vapor, nicotine and flavoring. All the component is made safe except nicotine which has been classified as bad for health. There are different types of e-liquid made which are PG (Propylene Glycol) and VG (Vegetable Glycerin). There are many company which use PG as e-liquid.
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