I DO have children. And grandchildren. My daughter smokes, and I have given her vape equipment in the hopes that she'll quit. She is doing both now, so we'll see.
My grandchildren aren't teens yet, and I would think it's rare for kids to show an interest in smoking or vaping until at least puberty. If you're worried about your 11 year old vaping, then teach her your values and keep a close eye on her. It's not hard to control the activities of younger children. But once they reach puberty, they start the process of growing into adults, and start pulling away and spending more time away from our watchful eyes. Then it's up to them, and if we've done a good job of teaching our values, they won't likely stray far from them.
If my grandchildren were to show an interest in vaping at puberty (12 or 13?), I would support it. I would educate them. Why? Because if they show an interest in vaping, they are probably of the mindset that would make them interested in smoking. If they vape first, then try cigarettes, I think the nasty taste of cigs would turn them off. I would much rather them vape.
So we shouldn't allow it because we don't know that it's safe? Then why do we allow them to drink sodas, eat candy, eat greasy burgers and fries, ride a bicycle, climb a tree? We KNOW there are inherent dangers in all of these activities.
And nicotine has actually been proven to be beneficial to your health, especially for those with cognitive disorders -
Growing List of Positive Effects of Nicotine Seen in Neurode... : Neurology Today . It's the tar, carbon monoxide, and 70 or so other toxic substances in cigarettes that concern me (and most of those come from the added chemicals - pure tobacco with no additives is FAR safer than the crap they sell in over-the-counter cigs - before I quit I was rolling my own cigs to avoid most of those chemicals).
I know that age restrictions on vaping will happen. I am not overly upset about it, but I cannot say that I support it because it is being pushed on us for all the wrong reasons, but under the banner of "protecting the children". I think that acquiring or maintaining power and control drives these laws (BT and "Public Health" officials have an interest in controlling vaping to further their agendas) and the general public will allow it mostly due to fear and ignorance.