1) A rechargeable Lithium Ion Battery
2) Nicotine and flavoring, suspended in a liquid state (primarily water and Propylene Glycol or Glycerin: All FDA approved food ingredients). These liquids are known as e-Juice.
3) An small absorbant strip of fabricwhich holds the e-Juice.
4) An eCigarette Atomizer which heats the liquid and atomizes it, this is where the vapor which looks like smoke is produced.
5) The actual e-Juice.
6) A mouth piece.