I won't argue about this because you're right about the long-term effect being unknown, and you can take this strictly as a personal experience, but after switching from analog to e-cigs about 5 years ago, the difference is night and day at least as far as tar is concerned. Tar ac ulation between gum and teeth when smoking regular cigarettes is huge and causes gum disease on almost everybody that smokes. There's no traces of tar at all with e-cigs.
That doesn't imply they don't you up some other way, but at least as far as tar is concerned, they appear to be, at least, a substantial upgrade health-wise.

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