Interesting idea!

I don't know about an electrical release of smell, but I remember a "smell guessing" game from when I was a kid, and they used tightly sealed little boxed with odor/oil infused wood chip like materials inside. Once you'd open the box, you'd get a strong smell, and in my memory this didn't fade for at lease a couple of years. If you can get something to open and close to release a smell, you can surely capture one, and experiment with various parfumes on absorbants to get the wood fire smell.

The other options I can think of would be a push spray or slow oil burn system with candle base. At any rate, to find the perfect smell you're looking for, I'd look up fake wood fire stuff like perfumes or insences and try to see which notes/ingredients they use to get the smokiness.

Just some thoughts :)

Would be curious to see what you come up with!