A female friend of mine got into trying to quit smoking.
Her solution (like everything else) was to find a substitute so she didn’t have to stop doing anything.
We went up to the local smoke shop, which is owned and operated by some Middle Easterners (not sure exactly where they are from)
She asked about buying and E-CIG, and since she and I were regular visitors, and my son has made friends with several of them, he told her YOU DON’T WANT THESE. THEY ARE BAD FOR YOU.
Turns out he was right. What did she do? Went somewhere else and bought an E-CIG anyway.
As for the cancer aspect: The only materials I've seen that have tested poorly are no-name Chinese pieces of junk that taste and smell awful. But every single one has tested better than a plain old cigarette.