What exactly are Electronic Cigarette? According to public information, it is mainly composed of four parts: e-liquid (including nicotine, essence, solvent propylene glycol, etc.), heat dissipation system, power supply and filter. Through cooling and atomization, an aerosol with a certain smell is produced for the smoker to use. In a broad sense, it refers to the electronic nicotine mailing system, including electronic cigarettes, hookahs, hookah pens and other forms. In a narrow sense, it refers to portable electronic cigarettes that look similar to cigarettes.