The Reductionary method
With the reductionary method, you first set your plan in place to begin quitting. Then, you'll get your e-juice in a staged reduction of nicotine, and follow a schedule to slowly decrease the amount of nicotine you take in. You can reduce it incrementally by the day, week, month, or whatever works best for you. Keep in mind that reducing it too fast could encourage a relapse by increasing the intensity of nicotine withdrawal, and we don't want that!
Do you know what helps with the reductionary method? A good source of quality vape juice that can be ordered in increments of nicotine all the way down to ZERO! Once at zero nicotine, try to find an e-liquid that you enjoy vaping so you are vaping for the flavor and not for the nicotine. After 2 weeks you will have no nicotine in your system, and you will be left with simply the habit of vaping, not an addiction to nicotine.