Electronic cigarettes having vaporizers with u shaped air path and methods of using the same

An electronic cigarette comprising:

• an electronic cigarette body having a top end, a bottom end and a first air intake opening defined on a first side wall of the electronic cigarette body;
• a mouthpiece assembly positioned on the top end of the electronic cigarette body;
• an E-liquid storage tank positioned inside of the electronic cigarette body, wherein the E-liquid storage tank comprises:
• an E-liquid storage cavity for storing E-liquid, a negative air pressure cavity, and a plurality of airflow channels forming a “U” shaped air path outside of the E-liquid storage cavity;
• and
• a vaporizer assembly wherein the vaporizer assembly comprises:
• one or more cylindrical E-liquid storage media for receiving and storing E-liquid from the E-liquid storage cavity, one or more heating elements in direct contact with interior surface of the one or more cylindrical E-liquid storage media to heat the E-liquid received from the E-liquid storage cavity, wherein the one or more heating elements are electrically connected to an electrical power supply through a negative air pressure activated switch,
• wherein when a user sucks air from the mouthpiece assembly, a negative air pressure is created in the negative air pressure cavity, the negative air pressure activated switch turns on the electrical power supply to the one or more heating elements, and the one or more heating elements vaporize the E-liquid stored in the one or more cylindrical E-liquid storage media to generate electronic cigarette vapor for the user through the “U” shaped air path.

A method of using an electronic cigarette having a vaporizer assembly with a “U” shaped air path, comprising:

• filling, by a user, E-liquid into an E-liquid storage tank, and storing the E-liquid in one or more cylindrical E-liquid storage media;
• sucking, by the user, through an air path of a mouthpiece assembly to generate a negative air pressure in a negative air pressure cavity;
• turning on an electrical power supply to one or more heating elements of the vaporizer assembly through a negative air pressure activated switch by the negative air pressure generated;
• and
• vaporizing, by the one or more heating elements of the vaporizer assembly, the E-liquid stored in the one or more cylindrical E-liquid storage media, and delivering vaporized E-liquid to the user through the “U” shaped air path.