Can I ban smoking for tennants at will?

[Chris Cyr]

I purchased a 6 unit recently.  There is 1 smoker on the first floor and it is awful.  The tenants are all TAW without any written agreement that was passed to me at closing.  I am going to implement a no smoking in or on the property policy.

Do I have to have all tenants sign a new TAW rental agreement before I can implement this?

Thanks!