Lemon extract will work fine, but it has alcohol in it too (lots actually), and once per ounce is WAY more expensive than vodka. It also has lots of lemon flavor in too, so it can leave behind a lemon flavor that might not blend well with your cake flavors. Personally, I use Pure Grain Alcohol (PGA) to paint with and I would NEVER drink that stuff!
Jenniffer White, Cup a Dee Cakes - http://cupadeecakes.blogspot.com
