What does it smell of?
Did you get a new one, or a second hand one?
Actually, what size did you get?
If it is second hand, and it some sort of 'previous owner' type smell, then there are a few things that can be done.
I have a very old one that smelled musty. I wafted it through insence, that sort of thing.
You can also put smelly herbs, like lavender, in a bag with the cards, and replace the old smell with a new one of your choosing.
Weird, isn't it, having something that smells of the previous owner.
It's a bit... icky.
Smell is such a deeply rooted thing in our subconcious minds, primal.
Also there are various spiritual cleansing things too.
But if the smell is a physical, actual smell, then it should be dealt with in a practical way.