well so what. it has not been determined that the amount used in
any e-juice is enough to be harmful. some day it may be proven to
be a mild irritant at most.this is being studied right now.
so what we have left is all FDA approved ingredients so quality and
purity are not issues. these except for the % of nicotine you can
pretty much ad the rest in the amount you prefer.
if i wanted to make a juice called really bad tasting stuff and,
it was really bad tasting stuff,i should be able to sell it.
anyone who would use ingredients other than food and pharmaceutical
grades are already breaking existing law.

regards
mike