Let's try to keep this really simple. If she is an adult, then she is free to make her own choices about vaping, or smoking for that matter. The key word here is ADULT. It is not like you were standing in an alley behind a school, calling "here kiddies, try some of this". The FDA can monitor these sites all they want. The FDA has approved many drugs that have proven to be fatal, or false. I, for one, do not trust the FDA one bit, nor would they be able to stop me in my "pursuit of happiness".
If any of you really believe that he enticed her to begin vaping, then the same can be said for all of you in this forum, as it was your posts, reviews, etc. that persuaded me into taking it up. Again, if she is an adult, the point is moot.
John