The components of an Electronic Cigarette are:

                   . The Electronic Cigarette (some like to have multiple e-cigs or styles)

 An Atomizer------------Charger----------Cartridges.

What does an electronic cigarette look like?

An electronic cigarette looks like a pen,
and it can be very discrete, or it can be a colorful fashion statement.
It is your choice depending on the model. 
Often, customers say that they will inhale their pen while in public and no
one realizes or notices what they are doing.        

 Does an electronic cigarette have smoke?

     An electronic cigarette does produce Vapor that tastes like smoke.
 

 Do electronic cigs have odor?

 No! an electronic cigarette does not have any smoke or odor. It has vapor instead.
But If you use some strong flavors you may get an aroma but a stinky smell No