Thinking of doing this type of post in its own thread, but for now, it fits here.
If we keep saying that long term testing is the answer (which we do), then all changes we make now, are skewing the data.
Truly from the non-vaper's perspective, if talking about "avoidable risks," the #1 consideration will be do not vape. If that leads vaper to say, I'll go back to smoking. The non-vaping, never smoker, is likely to say, "don't do that either."
Therefore, avoidable risk likely means something different to us than it would to someone that is (arguably) more objective. I think this point could be made clear with any number of analogies where I found new product that I enjoy, some health advocate says there is dangerous component to that product, and I ask people around me what they think. I believe most, if not all, will say stop using the new product. While there would be a few that would say, see if you can find that product without that component. But if the whole point is there is no long term testing on anything within the product (in the way I am choosing to use it), then does it really matter what component it is substituted with.
Where is the long term studies for vaping diketone-free liquids? Oh, that's right, there aren't any.
What if in year 15 of eLiquid's existence, humanity is able to reach zero percent of diketone in all existing eLiquids. Then in year 30, scientists of the day reach consensus that vaping is inherently dangerous. Would that not lead one to wonder if the outcome at that 30 year mark may have been different if diketones were still allowed?
Going forward, it would seem to make sense to have both type of eLiquids, until the long term studies are conclusive.
Even Dr. F. isn't in full agreement with other scientists on this issue. Main point of contention being how much can reasonably be allowed before it is considered harmful. Therefore, some can be allowed and it still be considered okay (by Dr. F. standards and other scientists). Yet, some vapers are chasing after zero percent and thinking that will lead to safer vaping.
Yet, to the non-vaper, the talk of avoidable risk will likely always be met with, stop vaping - at least until the long term studies are complete.