Security Deposit and smokers

[Byron Bohlsen]

I just bought an occupied duplex with long term tenants (Since 2008). Tenants decided to give notice at time of purchase. Tenants admitted there is about 3-4 years of smoke damage to the unit as they started smoking inside the unit a few years ago. 

Assuming the lease doesn't mention smoking, can I take anything out of their security deposit to recover damages? If so, what kind of damages?