Inherited tenant questions.

[Kurtis Montgomery]

I bought a duplex fully occupied in June.  Tenant A is neat and quiet.  Tenant B is a woman that can't do anything for herself, but she pays rent on time.  In the lease and my initial inspection, the tenant did not specify she had a small dog or that she smokes in the house.  I did not know this until today she said the locks are broken and so I installed new ones, in part so I could get keys.  She was working from home with her son and he was smoking inside and then there was a the dog (I knocked on the door and I heard him go crazy and there was a dog bowl out when I changed the locks). 

My question is how do I broach this subject?

The duplex I bought for 55k and I get $500 per unit totaling $1,000/month.  Tenant A's deposit came with the property, Tenant B's deposit he used for money she owed him.  I worked out a deal with her to pay me $50 extra a month till her $500 deposit is satisfied.  This is a lower income duplex, but its bombproof.  Metal roof, block foundation on slab, the interior is all tile, including the walk-in showers, this place could withstand a tornado.  $500 is about market value and I'd rather not do a tenant turnover if I don't have to.