I have only introduced ECF to tobacco users (cigerate, cigar, pipe or smokeless), never non-tobacco users. Nor have I ever recommended vaping to a non-tobacco user. I see vaping as a harm reduction option to tobacco, not something to start as a non-tobacco user.
As much I as a positive vaper person, it's from an ex-tobacco user. As it may be "95% or better less harmful than tobacco" it' probably not healthy. As an ex-tobacco user, I'm okay with that. But to go from 0% harm factor (ie. not using) to a higher harm ratio, I will not promote that.