I would think the amount of alcohol would be too low to trigger a warning, even mouth wash has alcohol in it.
I do however think that nicotine would show, if they test for it. They may if you have a health plan that gives lower rates to non-smokers.
If you're unsure of what they are actually testing for, I'd ask.
Full disclosure is a two way street and i would expect an employer to disclose why and what they are testing for.
Beyond vaping, I'd want to know what prescription medications are tested for and why.