The chemical odors are so strong that no one can be close by. 

You have no basis for saying “no harm, no foul” applies to finance.

We are applying for the second time now, but there is just a slight odor at this point. 

They are made of thicker plastic, tougher, and odor/juices won't leak through.

You can either cancel and they may reduce the fee to try to save the deal or take the hit and leave a foul review so people know of this bad practice 

Address shared space, private space, quiet hours, guests, animals, laundry, refrigerator, dirty dishes in the sink, noise, odors, and more.

Explain that it is a shared space, odor, health hazard, whatever.

Inform them they may be responsible for any smoking remediation that needs to be done on their move-out, such as carpet and curtain cleaning, painting, etc if there is a smoking odor or residue.3.

I have a clause that authorizes me to contact that person in case of "death, incapacitation, or incarceration" and work with that individual to coordinate removal of belongings, payment of rent, or even a refund of deposit.When someone dies alone, there is always a police investigation to ensure no foul play.

I believe that's the best way, no matter whom you represent.No harm, no foul.