I could live on custard day after day if it was possible,so saying I waited 12mths before trying a custard juice to vape.I found it so nice I've been mixing up vanilla custard flavouring with many other flavours(tobacco/raspberry/strawberry/caramel/butterscotch etc)which were all very nice.
I tend to vary flavours lots,rarely spending more than a day on any particular juice so no real #1 flavour.