Throughout the history of the development of electronic cigarettes, there have been several categories of products, which are described in detail here: 1. Cigar electronic cigarette: It should be said that the originator of electronic cigarette is just like cigar, which was invented in the beginning. 2. Pipe electronic cigarette: electronic cigarette shaped like a pipe; 3. Flat-mouthed electronic cigarette: the cigarette holder is plastic flat-mouthed; 4. Mini-electronic cigarettes: more like the size of cigarettes; 5. Ladies'electronic cigarettes: They are very thin in diameter and resemble ladies' cigarettes. 6. Carmizer electronic cigarette (high-quality electronic cigarette): the atomizer and the smoke bomb are integrated together, it is not easy to leak liquid, and the amount of smoke is larger; 7. Electronic cigarette with soft cigarette holder: cigarette holder resembles cigarette holder; 8. Disposable electronic cigarette: the smoke pole of electronic cigarette can not be charged; 9. Disposable cigar electronic cigarette: shaped like a cigar, but the cigar pole can not be charged; 10. EGO electronic cigarette: larger shape; 11. VGO electronic cigarette: cartmizer shape larger EGO; 12. MEG smoke: Compared with other types of electronic smoke, MEG smoke has no circuit board. It relies entirely on mechanical principle to transport current to the atomizer end. Its battery capacity is generally large and can be replaced at the same time. 13. High-power electronic cigarette: It can adjust the number of electronic cigarette watts and bring pleasure of large amount of smoke. At present, electronic cigarettes are the most popular in the market.