Inherited a good tenant. But her husband smokes.

[Byron W.]

Long story short, I purchased a property some months ago. I'm about to draw up a new lease for the tenant to sign. She's been pretty great so far. However, I noticed that her husband does smoke inside of the unit. How would you handle this? Considering any other tenants I have in the building aren't allowed to smoke. And any tenants that move in after them won't be allowed to as well. Thanks!