Some may have very small thresholds for repair holdbacks on purchases but this is typically limited to make ready items not to exceed $2,500 in costs to cure.

It will give them a cure period to pay the rent in full.

Not a strong argument ;-) I still had to pay off the loan to cure the DOS. 

Then you have to see in your state your right to cure lawssome states like the ones we worked in Or and WA you could cure right up to 5 minutes before the sale was going to be cried.

If it is a credit/equity line, you could provide a lender letter that the funds are available immediately for funding - and cured any recission period. 

The violation - depending on your state - will provide a 'cure period' before eviction proceedings would begin. 

Long term hold, with buyer planning on carrying existing financing to term without the ability to quickly cure default — terrible strategy with huge risk for both parties.   

If they are in violation of the lease, give them a notice to cure. 

I would send a lease violation notice that advises the tenant that they have violated the no smoking provision of the lease and that it needs to be cured immediately - to include complying (not smoking) and remove any odor/damage that may have resulted.

You may have to evict which is generally the course it goes but do something/everything (legally available) to cure this quickly.