I believe it is important to tell people the whole truth:
It turns out it's not the nicotine we get hooked on, but is the MAOI's in tobacco alkaloids (the part of smoking a cigarette that gives us the, "Ahhh," and a sense of calm). And, that this is the reason nicotine replacement therapies often just "don't do it" for many. But, the Swedish figured out a long time ago that tobacco does not cause cancer, it's how you cure the tobacco, and they've come up with a different way to cure tobacco (using percolation instead of smoke) that let's you get the Whole Tobacco Alkaloids (WTA) without the Tobacco Specific Nitrosamines (TSNA's). Swedish SNUS, when produced using the percolation curing method (and a couple of companies in Sweden don't, but it's easy to find which ones don't use percolation) does not increase your chances of developing cancers of the mouth or pancreas. They just can't say it on television here, but that's kind of the whole truth.
Vaping e-juice allows us to get the look and feel of smoking, but it is different, it is lacking a certain ingredient, but is no less important to some as a way to replace smoking cigarettes...and that the power of the battery in combination with the appropriate resistance atomizer allow the vapor to be warm enough to more closely feel like smoking. Tiny batteries, the ones that look like a real cigarette just do not provide enough wattage to come close to real smoking, and will often turn people off from using an e-cig.
That's my spiel when someone asks.