It was probably ethyl maltol. I buy and use the liquid version and let someone else deal with the crystals.
Maltol is the crystals. Dissolving them in alcohol or crushing them and dissolving them in PG or VG produces what you want. Here's the thread where they talk about how to do that. Maltol crystals usually added at 10% to PG to make the solution.
Ethyl Maltol crystals question.
More about alcohol or not in the mix.
Ethyl Maltol Solutions (5-15%) - Nude Nicotine
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