> I'm not sure we can safely say we know the long-term impact of vaping nicotine yet.

So we can't say if it's a health crisis.. yet. Right? We also don't know of the long-term impact of melatonin but we're not considering people consuming it when they have insomnia to be a health crisis, right?

We've got evidence it's negatively affecting the known health crisis of cigarette smoking.

I'm inclined to treat non-addictive melatonin and extremely-addictive nicotine differently in how we approach potential health risks.