[ineedasername]

>>Stressing unknown harms

We have to measure and make decisions about unknown harms every day. We're not always good at it, but it's unavoidable. With respect to vaping, we know of very little in the way of foreign chemicals that can be safely inhaled. I think it's fair to say that available medical knowledge about inhaling chemicals points to a non-negligible chance that it might be bad for you. You seem to be saying we should mostly avoid reasoning about such uncertain risks. I'm saying it's not unreasonable to tell people, "we know inhaling many type of chemicals is harmful to your health, so there is potential for harm here as well. We'll know more in about a decade, and be fairly certain in 30 or 40 years."

Scientific rigor does not preclude reasoning about these risks before those 10 to 40 years are up.

[samatman]

If we don't inhale chemicals we die in a matter of minutes.