If you are currently a smoker and thinking about quitting with the aid of an e-cigarette, we recommend using a nicotine containing e-liquid. It aids you a lot in staying away from them.
For newer / more advanced e-cigarettes:
For most newer models of e-cigarettes we recommend a nicotine strength of 3-6mg for a good vaping experience. Newer e-cigarettes use low resistance coils which are more powerful than podsystems and older variants of e-cigs. A lower resistance means more vapor production, which in turn delivers more nicotine.
For older models of e-cigarettes as well as podsystems we recommend a nicotine strength of 12-18mg. A higher nicotine strength is better in this case due to the reduced amount of vapor production that these products have.
If you'd like to try some more advanced products such as RDA's, we recommend a nicotine strength of 1.5-3mg.