That would burn your stomach out...... but back in the old days, talking around 1995, Queen Vanilla Essence was the same strength as Bundaberg rum and was really cheap. You could even get a 200ml "hip flask" of the stuff for about $3 and yes I actually used to drink it, a slug in a can of pepsi and it was awesome - you walked around smelling like a custard tart for a day or so.
Another trick was to put a couple of the small bottles into a Macdonalds Vanilla thick shake and it made the liqueur that God drinks, far better than Advocaat or Baitz Island Cream.
Ingredients, alcohol, water, natural vanilla, sugar, so why indeed not.
Ahhhh
However too many people got onto it, and they voluntarily increased the price of a small bottle to over $5 so that loophole got closed off.