They add something to the tobacco to make the nicotine hit your system hard and fast, they call it "freebasing" believe it or not. E-cigs won't do this, you'll get a more mellow nicotine stream, no head rush, and it takes a bit longer to feel the nicotine. It's just different.
E-cigs were invented for hard core smoking addicts to use full time as a replacement for cigarettes. If you are a casual smoker (3 times per year) you may not see the benefits as clearly as we do -- since we were killing ourselves smoking before. But it's evident that any time you replace a tobacco cig with an e-cig you are doing something good for your health.
Thanks Rosa. Ok that's where that head rush, dizzy feeling I get with the first cig comes from. Because there is no rush, would you suggest a higher level of nicotine? I do want as good a throat hit as possible.