@Account Closed - As far as the smoker it would depend on their lease, which you must honor through the full term. As soon as the lease expires I would ban any smoking indoors or within 10 feet of indoors. I also put a provision that there is a $25 per butt clean up fee for any butts I find on the property. I have had this a few times, usually I give 1 warning about the butts and remind them of the lease provision and I never have to clean them up again.
Asbestos roof is of no concern.
When the smokers lease is up you non renew. Trying to inforce no smoking is like asking a tennat to teach their cat to use the toilet.
You can not rent to smokers if you do not want smoking.
Both of these things are a pro from the buying side for the exact reasons your questioning them. The majority of inexperienced investors will wonder... capitalize on that!
@Account Closed if you ever have to replace that asbestos roof and you probably would as it is likely pretty old, it will need a costly specialized crew to remove it and dispose of it properly.
Your cats aren’t toilet trained?