vape pen (English: VAPE or Electronic cigarette), commonly known as "electronic cigarette"; transliteration "Wib", is a kind of electric atomizer driven by rechargeable lithium polymer battery, through the heating of electronic liquid in the oil tank (commonly known as smoke oil, electronic liquid, E-liquid or E-juice; marijuana vape pen smoke oil contains propylene glycol, plant glycerin, food flavor or nicotine), electronic cigarettes do not need to burn, only produce "vapor" and no tar and carbon monoxide , Some medical professionals believe that it is a potential nicotine substitute. In theory, best e juice it can also reduce the impact of some traditional cigarettes on the body, the possibility of fire, and let smokers who replace cigarettes with e-cigarettes away from carcinogens in cigarettes.