What are the types of electronic cigarettes?

Classified according to the principle of smoke emission, e-liquid atomization type electronic cigarettes: use electric heating to atomize e-liquid to generate smoke, and heat non combustible electronic cigarettes: the main principle is low-temperature heating, which releases smoke by heating a new type of tobacco, abbreviated as Hnb, and the main feature is that a new type of tobacco similar to a rolled cigarette needs to be inserted into the tobacco rod