Enforce "No Smoking" rule on current tenants in new Purchase?

[Pete Sailhamer]

I am closing on an 8-unit shortly and have been debating back and forth on this one.  I have a no smoking rule in our lease that I use for all our rentals.  However a couple of the current tenants smoke as it has been allowed by the prior owner.  For the sake of health, sanitation, the well-being of other tenants, and risk of fire I have never allowed smoking.  However, I do actually care for the tenants that rent to me and don't want to displace them simply because I showed up.  One is an elderly lady who has lived there for 23 years.  I also know that by these tenants leaving, I have the opportunity to rehab those units and increase the value of the property.

Any advice on whether I should let them continue to smoke, or enact a no smoking rule once they sign my lease in 30 days?