Summarized in one word: Ignorance.
Exactly. While e-cigs aren't healthy (what is healthy these days..), they are much safer than normal cigarettes. Also the smoke from cigs is actually the worst, vape pens should also help with this.
If one doesn't want to quit smoking, then switching is preferred.
smoking is still smoking if its just smoking
Vaping is not smoking. It also really depends what you smoke, thus it isn't same either. Ignorance in the 21st century is strong.