Well you have to put things in perspective a bit as well.
Take for example someone who mixes a recipe with 8% Peach Juicy. That’s up to 25% ethyl alcohol in it, meaning 2% of this mix is ethyl alcohol.
Let’s say an average person takes 5 puffs from a drop of liquid, about 0.3ml… I’d say after 2 or 3 puffs you know it’s too harsh and unpleasant to vape. So that’s after having vaped about 0.006ml ethyl alcohol…
A not so very scientific opinion, and correct me if I’m wrong, but i bet that’s not really going to be a high enough concentration to be really dangerous and that’s why people don’t really see the point of big warning signs.
People are also sensitive to PG and they use it in much higher concentrations, I haven’t see any big warnings either.
I do however see a bigger reason why a little warning for alcohol would be more appropriate for those who choose not to consume it in any way or form (e.g. religious or other reasons).