It is really good to note that you have taken the decision of quitting smoking. However, while you have decided to kick this bad habit, you have stated in the same breath that you have taken the support of e-cigarette. That sounded somewhat weird to me.
E-cigarette is not an alternative to quitting smoking. It has not been approved so far by US Food and Drug Administration (FDA) as an alternative and may pose even a greater health hazard to normal cigarettes.
Kicking the habit of smoking requires just WILL-power. That is all. I have seen my friends who were heavy smokers quit the habit and never going back to it. They decided one day to just quit. That was it. You may also take assistance from the following link:
https://www.google.com/search?source=hp&ei=NUjAW8LUFYj1vgT2noKoBw&q=quit...
Quit smoking NOW before your doctor gives you the option: Either it's your cigarette or it's your life.